John 8:28
28 So Jesus said to them, “When you have lifted up the Son of Man, then you will know that I am he, and that I do nothing on my own authority, but speak just as the Father taught me.

Jesus Christ is the "I Am" in the old testament

Not only did Jesus claim to pre-exist the patriarch Abraham, but He identified himself as God using God’s name – I AM.

(John 8:59) At this, they picked up stones to stone him, but Jesus hid himself, slipping away from the temple grounds.”