ויקרא ז:כא פירוש: רמב״ן

OR AN UNCLEAN BEAST. Scripture speaks here briefly, mentioning only some of the unclean objects. But the same law applies to all [sources of uncleanness], for even if he touched the carcass of a clean animal and then ate holy food, he is liable to this [punishment of] excision. The nature of this excision I will explain in the section of forbidden marriages,¹³¹Further, 18:29. with the help of G-d.