Numbers 5:19

5:19 Then the priest will put the woman under oath and say to the her, “If no other ¹  man has had sexual relations with you, and if you have not gone astray and become defiled while under your husband’s authority, may you be free from this bitter water that brings a curse. ² 

Numbers 5:27

5:27 When he has made her drink the water, then, if she has defiled herself and behaved unfaithfully toward her husband, the water that brings a curse will enter her to produce bitterness – her abdomen will swell, her thigh will fall away, and the woman will become a curse among her people.

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¹ tn The word “other” is implied, since the woman would not be guilty of having sexual relations with her own husband.

² sn Although there would be stress involved, a woman who was innocent would have nothing to hide, and would be confident. The wording of the priest’s oath is actually designed to enable the potion to keep her from harm and not produce the physical effects it was designed to do.