"The next day (John) saw Jesus coming toward him and declared, "Here is the lamb of God who takes away the sin of the world!" John 1:29
Anyone who wishes to be saved must know that all his sins have been placed on the back of the Lamb! Therefore John points this Lamb to his disciples, saying: "Do you want to know where the sins of the world are placed for forgiveness? Then don't resort to the Law of Moses or betake yourselves to the devil. There, to be sure, you will find sins, but sins to terrify you and damn you. But if you really want to find a place where the sins of the world are exterminated and deleted, then cast your gaze upon the cross. The Lord places all our sins on the back of the Lamb..."
Therefore a Christian must cling simply to this verse and let no one rob him of it. For there is no other comfort either in heaven or on earth to fortify us against all attacks and temptations, especially in the agony of death.
Christ does bear the sin---not only mine and yours or that of any other indivdual, or only of one kingdom or country, but the sin of the entire world. And you, too, are a part of the world.
Luthers Works 22:163-164