That is that He commanded us that a rapist marry the woman he raped. And that is His, may He be exalted and may He be blessed, saying, "and she shall be his wife" (Deuteronomy 22:29). And it has already been explained in the Gemara, Makkot (Makkot 15a), that this negative commandment of rape - that "he cannot send her away all of his days" - is a negative commandment that is preceded by a positive commandment. Hence it has already become clear that this, "and she shall be his wife," is a positive commandment. And the laws of this commandment have already been explained in [Chapter] 3 and 4 of Ketubot. (See Parashat Ki Tetzei; Mishneh Torah, Virgin Maiden.)