The next day, he saw Jesus coming to him, and said, "Behold, the Lamb of God, who takes away the sin of the world!
By the word Lamb he alludes to the ancient sacrifices of the Law. He had to do with Jews who, having been accustomed to sacrifices, could not be instructed about atonement for sins in any other way than by holding out to them a sacrifice. As there were various kinds of them, he makes one, by a figure of speech, to stand for the whole; and it is probable that John alluded to the paschal lamb. It must be observed, in general, that John employed this mode of expression, which was better adapted to instruct the Jews, and possessed greater force; as in our own day, in consequence of baptism being generally practiced, we understand better what is meant by obtaining forgiveness of sins through the blood of Christ, when we are told that we are washed and cleansed by it from our pollutions. At the same time, as the Jews commonly held superstitious notions about sacrifices, he corrects this fault in passing, by reminding them of the object to which all the sacrifices were directed. It was a very wicked abuse of the institution of sacrifice, that they had their confidence fixed on the outward signs; and therefore John, holding out Christ, testifies that he is the Lamb of God; by which he means that all the sacrifices, which the Jews were accustomed to offer under the Law, had no power whatever to atone for sins, but that they were only figures, the truth of which was manifested in Christ himself. 