Cross reference
Lamentations 4:15
15 Away! unclean! they were crying out to them, Away! away! let there be no touching: when they went away in flight and wandering, men said among the nations, There is no further resting-place for them.
Leviticus 13:45-46
45 And the leper who has the disease on him is to go about with signs of grief, with his hair loose and his mouth covered, crying, Unclean, unclean.
46 While the disease is on him, he will be unclean. He is unclean: let him keep by himself, living outside the tent-circle.