Matthew 28:16-20 Now the eleven disciples went to Galilee, to the mountain to which Jesus had directed them. ¹⁷And when they saw him they worshiped him, but some doubted. ¹⁸And Jesus came and said to them, “All authority in heaven and on earth has been given to me. ¹⁹Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, ²⁰teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.”

Isaiah 6:1-8 (ESV) In the year that King Uzziah died I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple. ²Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. ³And one called to another and said: “Holy, holy, holy is the Lord of hosts; the whole earth is full of his glory!” ⁴And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. ⁵And I said: “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for my eyes have seen the King, the Lord of hosts!” ⁶Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. ⁷And he touched my mouth and said: “Behold, this has touched your lips; your guilt is taken away, and your sin atoned for.” ⁸And I heard the voice of the Lord saying, “Whom shall I send, and who will go for us?” Then I said, “Here I am! Send me.”

The Athanasian Creed
Whoever wishes to be saved must, above all else, hold to the true Christian faith. Whoever does not keep this faith pure in all points will certainly perish forever.

Now this is the true Christian faith: We worship one God in three persons and three persons in one God, without mixing the persons or dividing the divine being. For each person—the Father, the Son, and the Holy Spirit—is distinct, but the deity of Father, Son, and Holy Spirit is one, equal in glory and coeternal in majesty. What the Father is, so is the Son, and so is the Holy Spirit. The Father is uncreated, the Son uncreated, the Holy Spirit uncreated; the Father is infinite, the Son infinite, the Holy Spirit infinite; the Father is eternal, the Son eternal, the Holy Spirit eternal; yet they are not three who are eternal, but there is one who is eternal, just as they are not three who are uncreated, nor three who are infinite, but there is one who is uncreated and one who is infinite. In the same way the Father is almighty, the Son is almighty, and the Holy Spirit is almighty; yet they are not three who are almighty, but there is one who is almighty. So the Father is God, the Son is God, the Holy Spirit is God; yet they are not three Gods, but one God. So the Father is Lord, the Son is Lord, the Holy Spirit is Lord; yet they are not three Lords, but one Lord. For just as Christian truth compels us to confess each person individually to be God and Lord, so the true Christian faith forbids us to speak of three Gods or three Lords. The Father is neither made nor created nor begotten of anyone. The Son is neither made nor created, but is begotten of the Father alone. The Holy Spirit is neither made nor created nor begotten, but proceeds from the Father and the Son. So there is one Father, not three Fathers; one Son, not three Sons; one Holy Spirit, not three Holy Spirits. And within this Trinity none comes before or after; none is greater or inferior, but all three persons are coequal and coeternal, so that in every way, as stated before, all three persons are to be worshiped as one God and one God worshiped as three persons. Whoever wishes to be saved must have this conviction of the Trinity.

It is furthermore necessary for eternal salvation truly to believe that our Lord Jesus Christ also took on human flesh. Now this is the true Christian faith: We believe and confess that our Lord Jesus Christ, God’s Son, is both God and man. He is God, eternally begotten from the nature of the Father, and he is man, born in time from the nature of his mother, fully God, fully man, with rational soul and human flesh, equal to the Father as to his deity, less than the Father as to his humanity; and though he is both God and Man, Christ is not two persons but one, one, not by changing the deity into flesh, but by taking the humanity into God; one, indeed, not by mixture of the natures, but by unity in one person; for just as the rational soul and flesh are one human being, so God and man are one Christ. He suffered for our salvation, descended into hell, rose the third day from the dead. He ascended into heaven, is seated at the right hand of God the Father almighty, and from there he will come to judge the living and the dead. At his coming all people will rise with their own bodies to answer for their personal deeds. Those who have done good will enter eternal life, but those who have done evil will go into eternal fire.

This is the true Christian faith. Whoever does not faithfully and firmly believe this cannot be saved.

Matthew 3:13-17 Then Jesus came from Galilee to the Jordan to John, to be baptized by him. ¹⁴John would have prevented him, saying, “I need to be baptized by you, and do you come to me?” ¹⁵But Jesus answered him, “Let it be so now, for thus it is fitting for us to fulfill all righteousness.” Then he consented. ¹⁶And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him; ¹⁷and behold, a voice from heaven said, “This is my beloved Son, with whom I am well pleased.”

Matthew 4:1-11 Then Jesus was led up by the Spirit into the wilderness to be tempted by the devil. ²And after fasting forty days and forty nights, he was hungry. ³And the tempter came and said to him, “If you are the Son of God, command these stones to become loaves of bread.” ⁴But he answered, “It is written, “‘Man shall not live by bread alone, but by every word that comes from the mouth of God.’” ⁵Then the devil took him to the holy city and set him on the pinnacle of the temple ⁶and said to him, “If you are the Son of God, throw yourself down, for it is written, “‘He will command his angels concerning you,’ and “‘On their hands they will bear you up, lest you strike your foot against a stone.’” ⁷Jesus said to him, “Again it is written, ‘You shall not put the Lord your God to the test.’” ⁸Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their glory. ⁹And he said to him, “All these I will give you, if you will fall down and worship me.” ¹⁰Then Jesus said to him, “Be gone, Satan! For it is written, “‘You shall worship the Lord your God and him only shall you serve.’” ¹¹Then the devil left him, and behold, angels came and were ministering to him.

Matthew 4:1-11 Then Jesus was led up by the Spirit into the wilderness to be tempted by the devil. ² And after fasting forty days and forty nights, he was hungry. ³ And the tempter came and said to him, “If you are the Son of God, command these stones to become loaves of bread.” ⁴ But he answered, “It is written, “‘Man shall not live by bread alone, but by every word that comes from the mouth of God.’” ⁵ Then the devil took him to the holy city and set him on the pinnacle of the temple ⁶ and said to him, “If you are the Son of God, throw yourself down, for it is written, “‘He will command his angels concerning you,’ and “‘On their hands they will bear you up, lest you strike your foot against a stone.’” ⁷ Jesus said to him, “Again it is written, ‘You shall not put the Lord your God to the test.’” ⁸ Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their glory. ⁹ And he said to him, “All these I will give you, if you will fall down and worship me.” ¹⁰ Then Jesus said to him, “Be gone, Satan! For it is written, “‘You shall worship the Lord your God and him only shall you serve.’” ¹¹ Then the devil left him, and behold, angels came and were ministering to him.

Matthew 4:1-11 Then Jesus was led up by the Spirit into the wilderness to be tempted by the devil. ²And after fasting forty days and forty nights, he was hungry. ³And the tempter came and said to him, “If you are the Son of God, command these stones to become loaves of bread.” ⁴But he answered, “It is written, “‘Man shall not live by bread alone, but by every word that comes from the mouth of God.’” ⁵Then the devil took him to the holy city and set him on the pinnacle of the temple ⁶and said to him, “If you are the Son of God, throw yourself down, for it is written, “‘He will command his angels concerning you,’ and “‘On their hands they will bear you up, lest you strike your foot against a stone.’” ⁷Jesus said to him, “Again it is written, ‘You shall not put the Lord your God to the test.’” ⁸Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their glory. ⁹And he said to him, “All these I will give you, if you will fall down and worship me.” ¹⁰Then Jesus said to him, “Be gone, Satan! For it is written, “‘You shall worship the Lord your God and him only shall you serve.’” ¹¹Then the devil left him, and behold, angels came and were ministering to him.

Matthew 5:1-12 Seeing the crowds, he went up on the mountain, and when he sat down, his disciples came to him. ²And he opened his mouth and taught them, saying: ³“Blessed are the poor in spirit, for theirs is the kingdom of heaven. ⁴“Blessed are those who mourn, for they shall be comforted. ⁵“Blessed are the meek, for they shall inherit the earth. ⁶“Blessed are those who hunger and thirst for righteousness, for they shall be satisfied. ⁷“Blessed are the merciful, for they shall receive mercy. ⁸“Blessed are the pure in heart, for they shall see God. ⁹“Blessed are the peacemakers, for they shall be called sons of God. ¹⁰“Blessed are those who are persecuted for righteousness' sake, for theirs is the kingdom of heaven. ¹¹“Blessed are you when others revile you and persecute you and utter all kinds of evil against you falsely on my account. ¹²Rejoice and be glad, for your reward is great in heaven, for so they persecuted the prophets who were before you.

Matthew 5:20-26 ^“For I tell you, unless your righteousness exceeds that of the scribes and Pharisees, you will never enter the kingdom of heaven. ²¹“You have heard that it was said to those of old, ‘You shall not murder; and whoever murders will be liable to judgment.’ ²²But I say to you that everyone who is angry with his brother will be liable to judgment; whoever insults his brother will be liable to the council; and whoever says, ‘You fool!’ will be liable to the hell of fire. ²³So if you are offering your gift at the altar and there remember that your brother has something against you, ²⁴leave your gift there before the altar and go. First be reconciled to your brother, and then come and offer your gift. ²⁵Come to terms quickly with your accuser while you are going with him to court, lest your accuser hand you over to the judge, and the judge to the guard, and you be put in prison. ²⁶Truly, I say to you, you will never get out until you have paid the last penny.”

Romans 6:3-11 Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? ⁴We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life. ⁵For if we have been united with him in a death like his, we shall certainly be united with him in a resurrection like his. ⁶We know that our old self was crucified with him in order that the body of sin might be brought to nothing, so that we would no longer be enslaved to sin. ⁷For one who has died has been set free from sin. ⁸Now if we have died with Christ, we believe that we will also live with him. ⁹We know that Christ, being raised from the dead, will never die again; death no longer has dominion over him. ¹⁰For the death he died he died to sin, once for all, but the life he lives he lives to God. ¹¹So you also must consider yourselves dead to sin and alive to God in Christ Jesus.