'Unfaithful' in the Bible

“Speak to the sons of Israel and say to them, ‘If any man’s wife goes astray and is unfaithful to him,

When he has made her drink the water, then it shall come about, if she has defiled herself and has been unfaithful to her husband, that the water which brings a curse will go into her and cause bitterness, and her abdomen will swell and her thigh will waste away, and the woman will become a curse among her people.