Numbers 12:10-15

10But when the cloud had withdrawn from over the tent, behold, Miriam was leprous, as white as snow. And Aaron turned and looked at Miriam, and, behold, she was leprous.

11Then Aaron said to Moses, “Oh, my lord, I plead with you, do not account this sin to us, in which we have acted foolishly and in which we have sinned.

12Oh, do not let her be like one dead, already half decomposed when he comes from his mother’s womb.”

13So Moses cried out to the Lord, saying, “Heal her please, O God, I plead with You!”

14But the Lord said to Moses, “If her father had but spit in her face, would she not bear her shame for seven days? Let her be shut up outside the camp for seven days, and afterward she may return.”

15So Miriam was shut up outside the camp for seven days, and the people did not move on until Miriam was brought in again [and declared ceremonially clean from her leprosy].