And the Lord spake unto Moses and unto Aaron,.... Aaron is addressed again, though left out in the preceding law, because the laws concerning leprosy chiefly concerned the priests, whose business it was to judge of it, and cleanse from it; and so Ben Gersom observes, mention is made of Aaron here, because to him and his sons belonged the affair of leprosies, to pronounce unclean or clean, to shut up or set free, and, as Aben Ezra says, according to his determination were all the plagues or strokes of a man, who should be declared clean or unclean:
saying; as follows.