But if the scall spread much in his skin after cleansing. After he has been declared clean by the priest; for it was possible that it might spread after this, though so much precaution had been used, and so much time taken to observe it: with this compare 2 Peter 1:9.

But if the eruption spread even after his purification, the priest, on seeing this, was not to look for yellow hair. "He is unclean:" that is to say, he was to pronounce him unclean without searching for yellow hairs; the spread of the eruption was a sufficient proof of the leprosy.

But if the scall spread much in the skin after his cleansing;

13:18-44 The priest is told what judgment to make, if there were any appearance of a leprosy in old sores; and such is the danger of those who having escaped the pollutions of the world are again entangled therein. Or, in a burn by accident, ver. 24. The burning of strife and contention often occasions the rising and breaking out of that corruption, which proves that men are unclean. Human life lies exposed to many grievances. With what troops of diseases are we beset on every side; and thy all entered by sin! If the constitution be healthy, and the body lively and easy, we are bound to glorify God with our bodies. Particular note was taken of the leprosy, if in the head. If the leprosy of sin has seized the head; if the judgment be corrupted, and wicked principles, which support wicked practices, are embraced, it is utter uncleanness, from which few are cleansed. Soundness in the faith keeps leprosy from the head.