Genesis 35:2

35:2 So Jacob told his household and all who were with him, “Get rid of the foreign gods you have among you. Purify yourselves and change your clothes.

Exodus 19:10

19:10 The Lord said to Moses, “Go to the people and sanctify them today and tomorrow, and make them wash their clothes

Exodus 19:15

19:15 He said to the people, “Be ready for the third day. Do not go near your wives.”

Joshua 7:13

7:13 Get up! Ritually consecrate the people and tell them this: ‘Ritually consecrate yourselves for tomorrow, because the Lord God of Israel says, “You are contaminated, O Israel! You will not be able to stand before your enemies until you remove what is contaminating you.”