The priest is to stand the woman before Yahweh and loosen the hair of the woman’s head, and put the grain offering of remembrance in her hands, which is the grain offering of jealousy. The priest is to have in his hand the water of bitterness that brings a curse. Bible see other translations

“water of bitterness.” So called because the whole process was bitter and if the woman was guilty her judgment was bitter.

Commentary for: Numbers 5:18