Numbers 5:12-14

12“Speak to the Israelites and say to them: ‘If a man’s wife goes astray and is unfaithful to him

13so that another man has sexual relations with her, and this is hidden from her husband and her impurity is undetected (since there is no witness against her and she has not been caught in the act),

14and if feelings of jealousy come over her husband and he suspects his wife and she is impure—or if he is jealous and suspects her even though she is not impure—