Numbers 9:22

9:22 Whether it was for two days, or a month, or a year, that the cloud prolonged its stay over the tabernacle, the Israelites remained camped without traveling; but when it was taken up, they traveled on.

Numbers 19:18

19:18 Then a ceremonially clean person must take hyssop, dip it in the water, and sprinkle it on the tent, on all its furnishings, and on the people who were there, or on the one who touched a bone, or one killed, or one who died, or a grave.