Cross reference
Numbers 31:20
20 As to every garment, and all that is made of skin, and all work of goats' [hair], and all things made of wood, you shall purify yourselves.
Genesis 35:2
2 Then Jacob said to his household, and to all who were with him, "Put away the foreign gods that are among you, purify yourselves, change your garments.
Exodus 19:10
10 Yahweh said to Moses, "Go to the people, and sanctify them today and tomorrow, and let them wash their garments,
Numbers 19:14-16
14 This is the law when a man dies in a tent: everyone who comes into the tent, and everyone who is in the tent, shall be unclean seven days.
15 Every open vessel, which has no covering bound on it, is unclean.
16 Whoever in the open field touches one who is slain with a sword, or a dead body, or a bone of a man, or a grave, shall be unclean seven days.
Numbers 19:22
22 Whatever the unclean person touches shall be unclean; and the soul that touches it shall be unclean until even.