'Take an Oath' in the Bible

Then the priest shall have her take an oath and say to the woman, “If no man has lain with you and if you have not gone astray into uncleanness [while married], then be immune to this water of bitterness that brings a curse;

Then the priest shall charge the woman to take an oath of cursing, and the priest shall say unto the woman, The LORD make you a curse and an oath among your people, when the LORD does make your thigh to rot, and your belly to swell;