Bamidbar 5:21

21 Then the kohen shall put the isha under oath with the oath of the curse, and the kohen shall say unto the isha, Hashem make thee an alah (curse) and a shevu’ah (oath) among thy people, when Hashem doth make thy thigh to waste away, and thy belly to swell;

Bamidbar 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.

Bamidbar 5:21 In-Context

19 And the kohen shall put her under oath, and say unto the isha, If no man have lain with thee, and if thou hast not turned astray to tum’a (uncleanness, impurity) with another instead of thy husband, be thou free from these mei hamarim hame’ararim;

20 But if thou hast turned astray to another instead of thy ish, and if thou be defiled, and some man have lain with thee other than thine ish;

21 Then the kohen shall put the isha under oath with the oath of the curse, and the kohen shall say unto the isha, Hashem make thee an alah (curse) and a shevu’ah (oath) among thy people, when Hashem doth make thy thigh to waste away, and thy belly to swell;

22 And this mayim that causeth the curse shall go into thy inner parts, to make thy belly to swell, and thy thigh to waste away; And the isha shall say, Omen, Omen.

23 And the kohen shall write these alot (curses) on a sefer, and he shall wash them into the mei hamarim;