Deuteronomy 23:10

Overview - Deuteronomy 23
Who may or may not enter into the congregation.
Uncleanness is to be avoided in the host.
15 Of the fugitive servant.
17 Of filthiness.
18 Of abominable sacrifices.
19 Of usury.
21 Of vows.
24 Of trespasses.
Treasury of Scripture Knowledge

Deuteronomy 23:10  (King James Version)
If there be among you any man, that is not clean by reason of uncleanness that chanceth him by night, then shall he go abroad out of the camp, he shall not come within the camp:

Leviticus 15:16 ; Numbers 5:2 Numbers 5:3 ; 1 Corinthians 5:11-13