The priest shall charge her by an oath, &c.— These two verses, and the two following, contain a species or formula of summons or adjuration, which the priest tendered to the person accused: a form, which was always expressed in the vulgar tongue, even when the Hebrew language ceased, as Maimonides has observed, and with him an anonymous writer quoted by Wagenseil.
Related Commentaries of Numbers 5:19
Numbers 5:19-20
19 And the priest shall charge her by an oath, and say unto the woman, If no man have lain with thee, and if thou hast not gone aside to uncleanness with another instead of thy husband, be thou free from this bitter water that causeth the curse:
20 But if thou hast gone aside to another instead of thy husband, and if thou be defiled, and some man have lain with thee beside thine husband: