The Trinity is the belief that God is manifested in 3 separate persons, the Father, The Son and the Holy Spirit. The Trinitarian doesn’t believe in three Gods. He believes in One God, but three separate beings.
So, does the Bible support this belief? Short answer—- yes. Though the word, “Trinity” does not appear in the Bible the doctrine is certainly there. Here’s proof.
Here are some verses that show the Diety of Christ and/or proof of the Trinity:
1. The trinity is found in the very first verse of the Bible.
Genesis 1:1 KJV
In the beginning God created the heaven and the earth.
The Hebrew word translated for God in that verse is, Eloh-im. The ending “im” is plural. It literally means 3 or more. Any Hebrew scholar could tell you that
2. In the same Chapter of Genesis 1 we see the Trinity.
Genesis 1:26a KJV
“And God said, Let US make man in OUR image, after OUR likeness…”
He’s not talking to the angels because we’re aren’t made in their image. We are made in God’s image. Why does God refer to himself in the plural? Is he skitso? No, of course not. This is clearly the Trinity. There is no logical explanation otherwise.
3. Jesus is called The mighty…. (wait for it)…. God and The everlasting Father.
This is an old testament prophecy of the future Messiah, Jesus Christ.
Isaiah 9:6 KJV
For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
4. The Father calls Jesus God.
“But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom.”
5. Jesus Created all things.
For by him(Jesus) were all things created, that are in heaven, and that are in earth…all things were created by him, and for him:
In the beginning God created the heaven and the earth.
The only way to reconcile these two verses is….Jesus=God.
6. The Word is God!
Jesus is the Word. The Word is God.
In the beginning was the Word, and the Word was with God, and the Word WAS God.
 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
7. Jesus refers to himself as the I Am. A title Jehovah God bears.
Then the Jews tried to stone him because they knew the claim he was making.
“Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.  Then took they up stones to cast at him: but Jesus hid himself…”
Old testament reference:
Exodus 3:13-14 KJV
And Moses said unto God, Behold, when I come unto the children of Israel, and shall say unto them, The God of your fathers hath sent me unto you; and they shall say to me, What is his name? what shall I say unto them?  And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you.
8. Jesus receives worship.
“And as they went to tell his disciples, behold, Jesus met them, saying, All hail. And they came and held him by the feet, and worshipped him.”
The Bible is clear that it’s blasphemy to worship any but God.
Yet Jesus does not rebuke them.
9. Thomas calls Jesus God.
“And Thomas answered and said unto him, My Lord and my God.”
Wow blasphemy! Wait… in the very next verse Jesus blesses Thomas for believing.
If Jesus was Not God, it would have been absolute blasphemy for Thomas to call him, “My God”. And Jesus would have rebuked him. But Jesus blesses him in the next verse for believing.
10. Jesus says he’s one with the Father.
John 10:30 KJV
I and my Father are one.
And no, it doesn’t say one in purpose. In the next verse the Jews tried to stone him. They wouldn’t have tried to kill him if he was saying he was one in purpose with the Father. They knew what he was saying.
11. Jesus is equal with God.
Hm this would be blasphemy if Jesus isn’t God. God doesn’t share equality with anyone.
Philippians 2:5-8 KJV
Let this mind be in you, which was also in Christ Jesus:  Who, being in the form of God, thought it not robbery to be equal with God: But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:  And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.
12. Three in one.
1 John 5:7 KJV For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
13. Jesus refers to himself as the Alpha and Omega, first and last, beginning and End, the Almighty.
Revelation 1:8,11,17-18 KJV
 I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty.
 Saying, I am Alpha and Omega, the first and the last….
 And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not; I am the first and the last:
 I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.
Notice the colon between verse 17 and 18 indicating the same speaker. Who died and is alive for evermore? Not the Father. Jesus!
14. The Godhead.
The word Godhead is the same word as Trinity when used in the Bible.
Romans 1:20 KJV
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
There are more verses but we’ll keep it at that. The Bible is pretty clear that Jesus is Almighy God. He is one with the Father. Like we have 3 parts, (body, soul, spirit) God has three parts, (Father, Son, Holy Spirit).