John 8:57 KJV

Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham?
John 8:57, King James Version

In context

56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.

57 Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham?

58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.