Philippians 2:
5 Let this mind be in you, which was also in Christ Jesus:
6 Who, being in the form of God, thought it not robbery to be equal with God:
7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:
That is the KJV, let's see if the NASB makes it a bit more clear...
5 Have this attitude in yourselves which was also in Christ Jesus,
6 who, although He existed in the form of God, did not regard equality with God a thing to be grasped,
7 but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men.
"The key verb is "emptied". The possession of equality took place BEFORE the emptying. "Taking" the form of a servant descrbies the means of the "emptying," as does "being made in the likeness of men." Jesus was "made in the likeness of men" at the Incarnation.
Therefore, this passage teaches the deity of Christ ("form of God"), and as well as the distinct personhood of the Son prior to the Incarnation, Just as in John 1:1 and 17:5, the text is inarguable: the Son, as the Son, is eternal.
The Logos, the Word, eternally existed as God, and was in fellowship with the Father. (John 1:1)
The Son shared glory with the Father before the world existed. (John 17:5)
Prior to the Incarnation, the Son was divine and active. (Phil 2:5-7)"
"We see, then, the meaning of the oneness of God passages in the OT: They refer to a onenesss of BEING, not oneness of PERSON
They are in "tri" and "unity."
(partial quotes from.. Dr. James White.)