Here are just a few verses of many that refute both twin heresies of modalism (oneness) and arianism (Jesus was created, less than the Father and not equal to the Father):
Hebrews 1:8- 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.
Here we have God the Father speaking to God the Son and calling Him God.
John 5:23- That all men should honor the Son, even as they honour the Father. He that honoureth not the Son honoureth not the Father which hath sent Him.
Here we have Jesus the Son claiming He should be honored in the same way as the Father is honored.
Phillipians 2:6-8- 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.
Here we see before Jesus came to earth in the form of a man He was with the Father, in the form of God, and equal to God.
John 5:17-18- But Jesus answered them, My Father worketh hitherto, and I work.
Therefore the Jews sought the more to kill Him, because He not only had broken the sabbath, but said also that God was His Father, making Himself equal with God.
John 1:1-2- In the beginning was the Word, and the Word was with God, and the Word was God,
The same was in the beginning with God.
John 17:5- And now, O Father, glorify thou Me with Thine own self with the glory which I had with Thee before the world was.
He we see Jesus as God, with God, sharing the same glory as the Father, distinct from the Father, before the world was.
Hebrews 1:6- And again when He bringeth in the firstbegotten into the world, He saith, and let all the angels of God worship Him.
Here we see the God the Father, bringing God the Son who had been with Him in the form of God before the world was, into the world, as a man and commanding Him to be worshiped.
1 John 5:7- For there are three that bear record in heaven, The Father, the Word, and the Holy Ghost: and these three are one.
John 8:16-18- And yet if I judge, my judgment is true: for I am not alone, but I and the Father that sent me.
It is also written in your law, that the testimony of two men is true.
I am one that bear witness of myself, and the Father that sent me beareth witness of Me.
Jesus speaks of the Father and Himself being two witnesses, being sent by the Father, being not alone, but being with the Father.
One God Three persons