Be in his sight at a stay - Or, Does not alter in appearance.

But if the scall be in his sight at a stay,.... If in a few days, or in a short space of time after this, it should appear that the scall is at a full stop, and does not spread any further at all:
and that there is black hair grown up therein; which is a sign of health and soundness, and so of purity; yea, if it was green or red, so be it, it was not yellow, according to Jarchi, it was sufficient:
the scall is healed; from whence it appears that it had been a leprous scall, but was now healed, an entire stop being put to the spread of it; and though yellow hairs might have appeared in it, yet, as Gersom observes, two black hairs having grown up in it, it was a clear case that the corruption of the blood had departed, and it had returned to its former state:
he is clean, and the priest shall pronounce him clean; he was clean before, and is the reason why he pronounces him so; wherefore it is not the sentence of the priest, but the truth of his case that makes him clean; teaching, as Ainsworth observes, that the truth of a man's estate, discerned by the word and law of God, made the man clean or unclean, and not the sentence of the priest, if it swerved from the law.

But if, on the contrary, the eruption stood (see Leviticus 13:5), and black hair grew out of it, he was healed, and the person affected was to be declared clean.