Sotah 18A

כתבה על שני דפין ⁠— פסולה. ״ספר״ אחד אמר רחמנא, ולא שנים ושלשה ספרים.

If one wrote the scroll on two unattached pages, it is unfit, as God states in the Torah: “Scroll,” in the singular. It must be written on one scroll and not on two or 3 scrolls.

כתב אות אחת ומחק אות אחת, וכתב אות אחת ומחק אות אחת ⁠— פסולה, דכתיב: ״ועשה לה הכהן את כל התורה הזאת״.

If one wrote one letter and erased that one letter in water, and he then wrote one more letter and erased that one letter, it is unfit, as it is written: “And the priest should execute upon her all this law” (Numbers 5:30). The entire passage must be written completely and only then erased, all at once.

בעי רבא: כתב שתי מגילות לשתי סוטות, ומחקן לתוך כוס אחד, מהו? כתיבה לשמה בעינן, והאיכא, או דילמא בעינן נמי מחיקה לשמה?

§ Rava raised a dilemma: If one wrote two scrolls for two separate sota women but then erased both of the scrolls in one cup, what is the halakha? Do we require that only the writing be performed for the sake of a specific woman, in which case that is accomplished here? Or perhaps we require that also the erasure be performed for the sake of a specific woman, which is not accomplished here, since both scrolls are erased together?

ואם תמצא לומר בעינן נמי מחיקה לשמה, מחקן בשתי כוסות וחזר ועירבן, מהו? מחיקה לשמה בעינן, והאיכא, או דילמא הא לאו דידה קא שתיא והא לאו דידה קא שתיא?

And if you say that we require that also the erasure be for the sake of each specific woman, then if the priest erased them in two different cups and afterward mixed the water from both together again, what is the halakha? Do we require that only the erasure be for the sake of a specific woman, in which case that is accomplished here? Or perhaps since this sota does not drink from only her own water and that sota does not drink from only her own water, the water is disqualified?