Numbers 5:17-21

Then he shall take some holy water in a clay jar and put some dust from the tabernacle floor into the water. After the priest has made the woman stand before the LORD, he shall loosen her hair and place in her hands the reminder-offering, the grain offering for jealousy, while he himself holds the bitter water that brings a curse. Then the priest shall put the woman under oath and say to her, ‘If no other man has had sexual relations with you and you have not gone astray and become impure while married to your husband, may this bitter water that brings a curse not harm you. But if you have gone astray while married to your husband and you have made yourself impure by having sexual relations with a man other than your husband’ – here the priest is to put the woman under this curse – ‘may the LORD cause you to become a curse among your people when he makes your womb miscarry and your abdomen swell.