"In the beginning — That is, before any thing was formed - ere God began the great work of creation. This is the meaning of the word in Genesis 1:1, to which the evangelist evidently alludes.
Eternity is usually expressed by being before the foundation of the world. The eternity of God is so described (Ps. 90:2).
His co-existence with the Father:
Eternity is usually expressed by being before the foundation of the world. The eternity of God is so described (Ps. 90:2).
His co-existence with the Father:
---The Word was with God,
---and the Word was God."
Adam Clarke