Numbers 5:12-14

12‘Speak to the Israelites. Tell them to follow these rules. A woman may do wrong things against her husband.

13She might have had sex with another man. The husband might not know about this. His wife might have kept it secret. Nobody came in while it was happening. So there is nobody to say that it happened.

14But the man may think that it happened. He will be angry. But she may not have made herself unclean in that way.