"Unclean! Unclean"
by cm
Christ cleansing a leper, 1864
Public DomainChrist cleansing a leper, 1864 - Credit: Jean-Marie Melchior Doze

A reference to the Old Testament law for lepers:

And the leper in whom the plague is, his clothes shall be rent, and his head bare, and he shall put a covering upon his upper lip, and shall cry, Unclean, unclean.

Leviticus 13:45