When the merciful Father saw that we were being oppressed through the Law, that we were being held under a curse and that we could not be liberated from it by anything, he sent his Son into the world, heaped all the sins of all me upon him, and said to him: “Be Peter the denier; Paul the persecutor, blasphemer, and assaulter; David the Adulterer; the sinner who ate the apple in Paradise; the thief on the cross. In short, be the person of all me, the one who has committed the sins of all men. And see to it that you pay and make satisfaction for them.” Now the Law comes and says: “I find him a sinner, who takes upon himself the sins of all me. I do not see any other sins than those in him. Therefore let him die on the cross!” And so it attacks him and kills him. By this deed the whole world is purged and expiated from all sins, and thus it is set free from death and from every evil.
– Martin Luther on Galatians 3:13
Quoted by Timothy George in, “The Atonement in Martin Luther’s Theology,” The Glory of the Atonement (274-275)