Mark 11:31
"And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then did ye not believe him?"
Cross References (ranked by relevance)
John 1:15
John bare witness of him, and cried, saying, This was he of whom I spake, He that cometh after me is preferred before me: for he was before me.
John 1:29
The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
John 1:34
And I saw, and bare record that this is the Son of God.
John 1:36
And looking upon Jesus as he walked, he saith, Behold the Lamb of God!