Leviticus 13:31

But when the priest looks on the plague of the scall and if it does not look deeper than the skin and there is no black hair in it, then the priest shall shut up the one that has the plague of the scall seven days;

Treasury of Scripture Knowledge

Summary

And if the priest look on the plague of the scall, and, behold, it be not in sight deeper than the skin, and that there is no black hair in it; then the priest shall shut up him that hath the plague of the scall seven days:

Seven days

Bible References

Seven days

Leviticus 13:4
If the bright spot is white in the skin of his flesh and looks to be not deeper than the skin and the hair thereof is not turned white; then the priest shall shut up the one that has the plague seven days;