He existed before He was born

"Your father Abraham rejoiced to see My day, and he saw it and was glad." So the Jews said to Him, "You are not yet fifty years old, and have You seen Abraham?" Jesus said to them, "Truly, truly, I say to you, before Abraham was born, I am." Therefore they picked up stones to throw at Him, but Jesus hid Himself and went out of the temple.

(John 8:56-59)

"I glorified You on the earth, having accomplished the work which You have given Me to do. "Now, Father, glorify Me together with Yourself, with the glory which I had with You before the world was.

(John 17:4-5)