He bacame sin

Martin Luther said:

All the prophets did foresee in spirit, that Christ should become the greatest transgressor, murderer, adulterer, thief, rebel, blasphemer, etc. that ever was….for he being made a sacrifice, for the sins of the whole world, is not now an innocent person and without sins….Our most merciful Father…sent his only Son into the world and laid upon him the sins of all men, saying: Be thou Peter that denier; Paul that persecutor, blasphemer and cruel oppressor; David that adulterer; that sinner which did eat the apple in Paradise; that thief which hanged on the cross; and, briefly, be thou [that] person which hath committed the sins of all men; see therefore that thou pay and satisfy for them. Here now cometh the law and saith: I find him a sinner…therefore let him die upon the cross.

(found at Galatians, ed. Philip S. Watson (London: James Clarke, 1953), 269-271; on Gal 3:13)