John 1:36
"And looking upon Jesus as he walked, he saith, Behold the Lamb of God!"
Cross References (ranked by relevance)
John 1:29
11
The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
Hebrews 12:2
Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.