These passages all confirm that Jesus existed for eternity in Heaven before being born on earth.

(John 17:4-5 NIV) I have brought you glory on earth by completing the work you gave me to do. {5} And now, Father, glorify me in your presence with the glory I had with you before the world began.

(John 8:56-58 NIV) Your father Abraham rejoiced at the thought of seeing my day; he saw it and was glad." {57} "You are not yet fifty years old," the Jews said to him, "and you have seen Abraham!" {58} "I tell you the truth," Jesus answered, "before Abraham was born, I am!"

(John 1:1-4 NIV) In the beginning was the Word, and the Word was with God, and the Word was God. {2} He was with God in the beginning. {3} Through him all things were made; without him nothing was made that has been made. {4} In him was life, and that life was the light of men.

Despite your denials, John 1 is talking about Jesus in verses 1-4.