Q. 1. In John 1:29 and 1:36, John the Baptism referred to Jesus as the "Lamb of God." what did he mean by that expression?
"The next day he saw Jesus coming toward him and declared, “Here is the Lamb of God who takes away the sin of the world!" [John 1:29]
"..and as he watched Jesus walk by, he exclaimed, 'Look, here is the Lamb of God!'" [John 1:36]
A. 1. John the Baptist was making a reference to the Book of Isaiah where it said:
"He was oppressed, and he was afflicted, yet he did not open his mouth; like a lamb that is led to the slaughter, and like a sheep that before its shearers is silent, so he did not open his mouth." [Is. 53:7]
The words of John the Baptist were prophetic in nature. He saw Jesus as the Suffering Servant, Who in obedience to God, became the sacrificial victim, in atonement for the sins of the world.
It was God Himself who provided Jesus, as a Lamb, for the sacrifice of the Cross.
"After agreeing to baptize him along with the sinners, John the Baptist looked at Jesus and pointed him out as the "Lamb of God, who takes away the sin of the world". By doing so, he reveals that Jesus is at the same time the suffering Servant who silently allows himself to be led to the slaughter and who bears the sin of the multitudes, and also the Paschal Lamb, the symbol of Israel's redemption at the first Passover. Christ's whole life expresses his mission: "to serve, and to give his life as a ransom for many." [C.C.C. # 60]