Then the priest shall command that they wash [the
thing]
wherein the plague [is]
The priest did not wash it himself, but ordered others to do it;
and this was either the part in which the plague was, or the
whole garment or skin in which it was; which may be typical of
the washing of the garments of men in the blood of Christ, which
cleanses from all sin, ( Revelation
7:14 ) ( 1 John 1:7 ) ( Zechariah
13:1 ) : and he shall shut it up seven days
more:
the garment or skin in which the leprosy was, or suspected to be,
to see what alteration would be made by that time through the
washing, whether the colour would be altered, or whether it would
spread any more or not.