Rashi on Numbers 5:27/רש"י על במדבר ה׳:כ״ז

1והשקה את המים AND HE SHALL MAKE HER DRINK THE WATER — This statement made after Scripture has just said (v. 26) “and afterwards he shall make the woman drink the waters” (see Siphre) is intended to include the case that if she says, “I will not drink” after the scroll on which the Holy Name was written had been blotted out, they pour it into her and make her drink the water against her will — except if she adds: “I have been defiled” [when, of course, no further test is necessary] (Sotah 19b).

2וצבתה בטנה AND HER BELLY SHALL SWELL, [AND HER THIGH SHALL WASTE] — Although when uttering the curse (v. 21) he (the priest) mentioned the thigh first, for the reason given by Rashi in his comment there, the water tested her (i.e., affected her) only according to the manner it passed into her body (i.e., it affected the belly first since it first entered that part of her body and then the thigh) (Sotah 9b).

3והיתה האשה לאלה AND THE WOMAN SHALL BE AN EXECRATION — This means, as I have already explained (v. 21), that everyone shall curse by mention of her name.

4בקרב עמה [AND THE WOMAN SHALL BE AN EXECRATION] AMONG HER PEOPLE — This is stressed: "among her people” — because there is a difference between a person who is brought to disgrace in a place where he is well known and a person who is brought to disgrace in a place where he is unknown.