1- The Old Testament Describes Yahweh and the Messiah Doing Exactly the Same Activities.
Why I include some OT arguments is just to show that the idea of the trinity is not just something that some guy in the New Testament came up with one day on a boring afternoon. It was embedded in the OT before them. So, one example of this category is Ezekiel 34:11-15 11 “.. 15 I myself will be the shepherd of my sheep, and I myself will make them lie down, declares the Lord God. Cp Eg: Ezekiel 34:23-24 23 And I will set up over them one shepherd, my servant David, and he shall feed them: he shall feed them and be their shepherd. Here in the same chapter you get Yahweh and the Messiah being described as the shepherd of God’s people.
Also see Isaiah 11, 42, 49, 61 cp Isaiah 25, 35, 40, 59 ; Zech 6:12-13; 9:9-10, 13:7 cp Zech 9:14-16;14:9
2- The Old Testament Describes the Messiah in Ways that Sound Divine..
Eg Micah 5:1-2, – “But you, Bethlehem Ephrathah, though you are small among the clans of Judah, out of you will come for me one who will be ruler over Israel, whose origins are from of old, from ancient times.”
Or Daniel 7:13-14- 13 “In my vision at night I looked, and there before me was one like a son of man, coming with the clouds of heaven. He approached the Ancient of Days and was led into his presence.14 He was given authority, glory and sovereign power; all nations and peoples of every language worshiped him. His dominion is an everlasting dominion that will not pass away, and his kingdom is one that will never be destroyed.
Also: Psalm 45:6-7; Psalm 110:1
3- Old Testament Verses which Refer to God are Applied to Jesus in the New Testament..
Eg Hebrews 1:10- And, “You, Lord, laid the foundation of the earth in the beginning, and the heavens are the work of your hands; 11 they will perish, but you remain; they will all wear out like a garment, 12 like a robe you will roll them up, like a garment they will be changed. But you are the same, and your years will have no end.”
Also: Matthew 1:23, 3:3, Revelation 1:7
4- Old Testament Names or Titles of God are Quoted but Applied to Jesus.
Romans 10:13- 13 For “everyone who calls on the name of the Lord will be saved.” Cp Joel 2:32;
or, Philippians 2:10-11- so that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, 11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father. Cp Isaiah 45:22-23- For I am God, and there is no other. 23 By myself I have sworn; from my mouth has gone out in righteousness a word that shall not return: ‘To me every knee shall bow, every tongue shall swear allegiance.’
Or, cp- Eg: Isaiah 44:6 “Thus says the Lord, the King of Israel and his Redeemer, the Lord of hosts: “I am the first and I am the last; besides me there is no god.” Revelation 1:8 8 “I am the Alpha and the Omega,” says the Lord God, “who is and who was and who is to come, the Almighty.” Revelation 22:12-13 12 “Behold, I am coming soon, bringing my recompense with me, to repay each one for what he has done.13 I am the Alpha and the Omega, the first and the last, the beginning and the end.”
Also Matthew 3:3;
5- Jesus does things which only God can do.
Eg. Mark 2:5-7 5 And when Jesus saw their faith, he said to the paralytic,“Son, your sins are forgiven.” 6 Now some of the scribes were sitting there, questioning in their hearts,7 “Why does this man speak like that?He is blaspheming! Who can forgive sins but God alone?”
Also: Matthew 14:25; 24:30; 28:30; Mark 2:7.
6- Jesus is described in a horizontal relationship to His Father.
Eg. 1 Corinthians 1:3- 3 Grace to you and peace from God our Father and the Lord Jesus Christ. Eg. 1 Cor 8:5-6- 5 For although there may be so-called gods in heaven or on earth—as indeed there are many “gods” and many “lords”— 6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.
Also: Matthew 11:27; Mt 28:19; 1 Cor 1:3;
7- Jesus assumes the authority of God.
eg Matthew 12:6, 8- 6 I tell you, something (or, someone) greater than the temple is here. 7 And if you had known what this means, ‘I desire mercy, and not sacrifice,’ you would not have condemned the guiltless. 8 For the Son of Man is lord of the Sabbath.” Eg. John 5:23- 22 The Father judges no one, but has given all judgment to the Son,23 that all may honor the Son, just as they honor the Father. Whoever does not honor the Son does not honor the Father who sent him. John 8:58 58 Jesus said to them, “Truly, truly, I say to you, before Abraham was, I am.”
Also: Matthew 5:27-28; John 3:31; 8:58; 10:30; 14:9-10
8- Things are said of Jesus which logically make Him God.
Eg. John 1:3 3 All things were made through him, and without him was not any thing made that was made.
Also: Matthew 22:41-45; Colossians 1:16-19; 2:9; Titus 2:13 ; 1 John 1:1-2; Rev 1:17; 19:16; 1:8 cp 22:13
9- Jesus is worshipped and prayed to.
Matthew 2:2- “Where is he who has been born king of the Jews? For we saw his star when it rose and have come to worship him.”
Revelation 5:11-14- 11 Then I looked, and I heard around the throne and the living creatures and the elders the voice of many angels, numbering myriads of myriads and thousands of thousands, 12 saying with a loud voice, “Worthy is the Lamb who was slain, to receive power and wealth and wisdom and might and honor and glory and blessing!” 13 And I heard every creature in heaven and on earth and under the earth and in the sea, and all that is in them, saying, “To him who sits on the throne and to the Lamb be blessing and honor and glory and might forever and ever!” 14 And the four living creatures said, “Amen!” and the elders fell down and worshiped.
Also: John 9:38
10- Jesus is said to be God.
John 1:1- In the beginning was the Word, and the Word was with God, and the Word was God. Jn 20:28- 28 Thomas answered him, “My Lord and my God!” 29 Jesus said to him, “Have you believed because you have seen me? Blessed are those who have not seen and yet have believed.”
Hebrews 1:8- But of the Son he says, “Your throne, O God, is forever and ever, the scepter of uprightness is the scepter of your kingdom. 9 You have loved righteousness and hated wickedness; therefore God, your God, has anointed you with the oil of gladness beyond your companions.”
Also: John 5:18, Rom 9:5; Philippians 2:6; Colossians 2:9; Hebrews 1:8; 1 John 5:20