Deuteronomy 23:9 in the King James Version
When the host goeth forth against thine enemies, then keep thee from every wicked thing.
Context
8 The children of the third generation who are born to them may enter into the LORD’s assembly.
9 When you go out and camp against your enemies, then you shall keep yourselves from every evil thing.
10 If there is among you any man who is not clean by reason of that which happens to him by night, then shall he go outside of the camp. He shall not come within the camp;