Numbers 5:22, 27

and may this water that causes the curse go into your stomach, and make your belly swell and your thigh rot.” ‘Then the woman shall say, “Amen, so be it.”

When he has made her drink the water, then it shall be, if she has defiled herself and behaved unfaithfully toward her husband, that the water that brings a curse will enter her and become bitter, and her belly will swell, her thigh will rot, and the woman will become a curse among her people.