John 1:29-31

The next day John saw Jesus coming toward him and said, "Look, the Lamb of God, who takes away the sin of the world! This is the one I meant when I said, 'A man who comes after me has surpassed me because he was before me.' I myself did not know him, but the reason I came baptizing with water was that he might be revealed to Israel."

Look, the Lamb of God 
John 1:35-36  The next day John was there again with two of his disciples. When he saw Jesus passing by, he said, "Look, the Lamb of God!" 
Genesis 22:8  Abraham answered, "God himself will provide the lamb for the burnt offering, my son." And the two of them went on together.
Isaiah 53:7  He was oppressed and afflicted, yet he did not open his mouth; he was led like a lamb to the slaughter, and as a sheep before its shearers is silent, so he did not open his mouth.
1 Peter 1:18-19  For you know that it was not with perishable things such as silver or gold that you were redeemed from the empty way of life handed down to you from your ancestors, but with the precious blood of Christ, a lamb without blemish or defect.
Revelation 5:6  Then I saw a Lamb, looking as if it had been slain, standing at the center of the throne, encircled by the four living creatures and the elders. The Lamb had seven horns and seven eyes, which are the seven spirits of God sent out into all the earth.
Revelation 13:8  All inhabitants of the earth will worship the beast--all whose names have not been written in the Lamb's book of life, the Lamb who was slain from the creation of the world.

who takes away the sin of the world 
John 3:17  For God did not send his Son into the world to condemn the world, but to save the world through him.

"This is the one I meant when I said, 'A man who comes after me has surpassed me because he was before me.' " 
John 1:15  (John testified concerning him. He cried out, saying, "This is the one I spoke about when I said, 'He who comes after me has surpassed me because he was before me.' ")
John 1:27  "He is the one who comes after me, the straps of whose sandals I am not worthy to untie."

Scriptures taken from the Holy Bible, New International Version® NIV®, 
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