'Oath' in the Bible

The priest will require the woman to take an oath and will say to her, ‘If no man has slept with you, if you have not gone astray and become defiled while under your husband’s authority, be unaffected by this bitter water that brings a curse.

at this point the priest must make the woman take the oath with the sworn curse, and he is to say to her—‘May the Lord make you into an object of your people’s cursing and swearing when He makes your thigh shrivel and your belly swell.

When a man makes a vow to the Lord or swears an oath to put himself under an obligation, he must not break his word; he must do whatever he has promised.

“If a woman in her husband’s house has made a vow or put herself under an obligation with an oath,

So the Lord’s anger burned that day, and He swore an oath: