Bible Verses for Reference:
In the beginning was the Word, and the Word was with God, and the Word was God (Jhn 1:1).
And the Word was made flesh, and dwelled among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth (Jhn 1:14).
Jesus said to him, Have I been so long time with you, and yet have you not known me, Philip? he that has seen me has seen the Father; and how say you then, Show us the Father? Believe you not that I am in the Father, and the Father in me? the words that I speak to you I speak not of myself: but the Father that dwells in me, he does the works. Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake (Jhn 14:9-11).
I and my Father are one (Jhn 10:30).
Relevant Words of God:
The meaning of incarnation is that God appears in the flesh, and He comes to work among man of His creation in the image of a flesh. So, for God to be incarnated, He must first be flesh, flesh with normal humanity; this, at the very least, must be true. In fact, the implication of God’s incarnation is that God lives and works in the flesh, God in His very essence becomes flesh, becomes a man.
from “The Essence of the Flesh Inhabited by God” in The Word Appears in the Flesh