Numbers 5:22

And the woman shall say, Amen, amen.— If the woman, after this adjuration, persisted in pleading not guilty, she was to pronounce amen, or so be it, doubled, to express her hearty consent that it might be as the priest, in the name of God, had declared. If the woman acknowledged her guilt, she was immediately divorced without dowry, according to the Jewish canon: for the Scripture is very concise upon the subject; not informing us whether a woman might, or might not, be allowed to refuse drinking the water after the oath administered by the priest.