"When the army goes out against your enemies, then keep yourself from every wicked thing.
Deuteronomy 23:9
Surrounding context
23:8 The children of the third generation born to them may enter the assembly of the LORD.
23:9 "When the army goes out against your enemies, then keep yourself from every wicked thing.
23:10 If there is any man among you who becomes unclean by some occurrence in the night, then he shall go outside the camp; he shall not come inside the camp.