John 1:36

After gazing intently on Jesus as he walked about, he said, "Look! that is the Lamb of God!"

John 1:29

The next day he saw Jesus coming toward him, and said: "Behold, that is God's Lamb, who takes and bears away the sin of the world.

Hebrews 12:2

looking unto Jesus, the pioneer and perfecter of our faith, who for the joy that was set before him endured a cross, despising shame, and has now taken his seat at the right hand of the throne of God.

1 Peter 1:19-20

but with precious blood, like that of a lamb without spot or blemish, even the blood of Christ.

Treasury of Scripture Knowledge

Summary

And looking upon Jesus as he walked, he saith, Behold the Lamb of God!

Bible References

Behold

John 1:29
The next day he saw Jesus coming toward him, and said: "Behold, that is God's Lamb, who takes and bears away the sin of the world.
Hebrews 12:2
looking unto Jesus, the pioneer and perfecter of our faith, who for the joy that was set before him endured a cross, despising shame, and has now taken his seat at the right hand of the throne of God.
1 Peter 1:19
but with precious blood, like that of a lamb without spot or blemish, even the blood of Christ.