Leviticus 13:31

Black. The Hebrew, Samaritan, &c., prefix "not," which ought probably to be away, as the natural colour of the hair, in that country, is black; while yellow, or white hair, give reason to suspect leprosy; and (ver. 32,) the Hebrew says, "if there be no yellow hair in it," which insinuates that it was black before. The Septuagint have explained both verses in the same sense, as they found the negation also. If we admit it, we may distinguish black hair from that which approaches to brown, or light-coloured hair. When therefore a person, who had before black hair, has experienced some change, he must be shut up seven days; after which, if his hair be not become yellow or reddish, he must be shaved, &c. (Calmet)