Numbers 31:24
You must wash your clothes on the seventh day and be clean. After that you may enter the camp.
Leviticus 11:25
When you carry any part of their dead bodies you must wash your clothes. You will be unclean until evening.
Leviticus 14:9
On the seventh day you should again shave your head, your beard, your eyebrows, and all the rest of the hair on your body. You should wash your clothes and take a bath. Then you will be ritually clean.
Leviticus 15:13
When a man's discharge stops, he must wait seven days to be cleansed. He must wash his clothes and his body in fresh water. Then he will be clean.
Numbers 19:19
A person who is clean will sprinkle these types of unclean people on the third day and the seventh day. On the seventh day the clean person will finish taking away their sins. Then they must wash their clothes and bodies. In the evening they will be clean.