The Trinity is found all throughout scripture if any is willing to look and asks the Lord to reveal what is true. Here are only three examples:
Isaiah 48:16
Come near to Me, listen to this: from the first I have not spoken in secret, from the time it took place, I was there, and now Adonai-Yehovah has sent Me and His Spirit."
This is an indication of the personhood of both the Son and Holy Spirit in the Trinity.
Matthew 3:16-17
And after being baptized, Jesus went up immediately from the water; and behold, the heavens were opened, and he saw the Spirit of God descending as a dove, and coming upon Him, and behold, a voice out of the heavens, saying, ‘This is My beloved Son, in whom I am well-pleased.’
Matthew 28:18-20
And Jesus came up and spoke to them, saying, ‘All authority has been given to Me in heaven and on earth. go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit, teaching them to observe all that I commanded you, and lo, I am with you always, even to the end of the age.’
First verse: If this is referring to Jesus Christ, which it seems to be, it is speaking of his humanity. The man Jesus was sent by God, yet at the same time, he was God in every sense. At times the Scriptures talk of Jesus Christ as a man, at times they talk of him as God. But get this: Jesus IS God and MUST be recognized as God. When I say God, I don't mean putting him alongside two other entities. I mean making him God literally.
Second verse: The voice and similitude of a dove from heaven were signs to John the Baptist. Nowhere do we read of them as being evidence of a Triune God.
Third verse: Some friendly advice: Before posting a Scripture verse, make sure you don't shoot yourself in the foot. In Matthew 28, it says "in the NAME . . ." There is ONE name for the Father, for the Son, and for the Holy Ghost. That name is Jesus. And if all three have the same name, is it because they are the same person? Definitely! On that note, the apostles understood Jesus command, and baptised in JESUS' name! If anything, this verse points to Jesus being the Father, the Son, and the Holy Ghost, and therefore, God in every sense. Also, Jesus seemingly denies the other 'co-equal' members of the Trinity when he declares, "Lo I am with you, even until the end of the earth." Why didn't Jesus say 'We'?
Now answer this question:
If the Trinity really exists, how is it that Jesus is the ONLY Immortal 1Ti_6:16l? the EVERLASTING Father Isa_9:6 ? and finally, the ONLY GOD?
1Ti 1:17 Now unto the King eternal, immortal, invisible, the only wise God, be honour and glory for ever and ever. Amen.
1Ti 6:14 That thou keep this commandment without spot, unrebukeable, until the appearing of our Lord Jesus Christ:
1Ti 6:15 Which in his times he shall shew, who is the blessed and only Potentate, the King of kings, and Lord of lords;