John Lightfoot on John 1:29

[The Lamb of God.] St. John alludes plainly to the lamb of the daily sacrifice. Which in shadow took away the sins of Israel.

I. It was commanded in the law that he that offered the sacrifice should lay his hand upon the head of the sacrifice, Leviticus 1:4, 3:2, 4:4, &c.

II. The reason of which usage was, that he might, as it were, transfer his sins and guilt upon the head of the offering, which is more especially evident in the scapegoat, Leviticus 16:22.

Hence Christ is said "himself to have borne our sins in his own body on the tree," 1 Peter 2:24, as the offering upon the altar was wont to do. He was made by God a "sin for us," 2 Corinthians 5:21; that is, a sacrifice for sin.

III. The same rite was used about the lamb of the daily sacrifice that was offered for all Israel; "The stationary men [as they were called], or the substitutes of the people, laying their hands upon the head of the lamb."

To this therefore the words of the Baptist refer: "The lamb of God, that is, the daily sacrifice, taketh away the sins of the world, as the sacrifice did for all Israel. But behold here the true Lamb of God, that taketh away the sins of the world."