Numbers 5:21

21 then the priest shall adjure the woman by the oaths of this curse, and the priest shall say to the woman, The Lord bring thee into a curse and under an oath in the midst of thy people, in that the Lord should cause thy thigh to rot and thy belly to swell;

Numbers 5:21 Meaning and Commentary

Numbers 5:21

Then the priest shall charge the woman with an oath of
cursing
An oath which has a curse annexed to it, if taken falsely, which was to be pronounced upon the woman if guilty:

and the priest shall say unto the woman;
pronouncing the imprecation or curse upon her, she having taken the oath, should she be guilty of the crime suspected of, and she had swore concerning:

the Lord make thee a curse, and an oath among the people;
accursed according to the oath taken; or let this be the form of an oath and imprecation used by the people, saying, if I have done so and so, let me be accursed as such a woman, or let not that happen to me, as did to such a woman, so Jarchi:

when the Lord doth make thy thigh to rot, and thy belly to swell;
upon drinking the bitter waters; but though these things followed upon that, yet not as the natural cause of them, for they are ascribed to the Lord, and to a supernatural and miraculous power of his, which went along with the drinking of them.

Numbers 5:21 In-Context

19 And the priest shall adjure her, and shall say to the woman, If no one has lain with thee, and if thou hast not transgressed so as to be polluted, being under the power of thy husband, be free from this water of the conviction that causes the curse.

20 But if being a married woman thou hast transgressed, or been polluted, and any one has lain with thee, beside thy husband:

21 then the priest shall adjure the woman by the oaths of this curse, and the priest shall say to the woman, The Lord bring thee into a curse and under an oath in the midst of thy people, in that the Lord should cause thy thigh to rot and thy belly to swell;

22 and this water bringing the curse shall enter into thy womb to cause thy belly to swell, and thy thigh to rot. And the woman shall say, So be it, So be it.

23 And the priest shall write these curses in a book, and shall blot them out with the water of the conviction that brings the curse.