diftera, a hide that is only partially processed, as it is salted and treated with flour but not gallnuts; rather, it must be written only on a scroll of parchment, as it is stated: “And the priest shall write these curses in a scroll” (Numbers 5:23).

And the scribe may not write with gum [komos], and not with iron sulfate [kankantom], nor with any substance that makes a mark and cannot be completely erased, but only with ink made from soot, as it is stated in the continuation of the same verse: “And he shall blot them out into the water of bitterness” (Numbers 5:23). This indicates that the scroll must be written with a writing that can be erased in water.

GEMARA: Rava says: A scroll of a sota that one wrote at night is unfit. What is the reason for this? It is derived by verbal analogy between one instance of the word “law” and another instance of the word “law.” It is written here, with regard to a sota: “And the priest shall execute upon her all this law” (Numbers 5:30), and it is written there, with regard to judgment: “According to the law, which they shall teach you, and according to the judgment, which they shall tell you” (Deuteronomy 17:11). Just as judgment may be done only by day, so too the scroll of a sota may be written only by day.

If one wrote the scroll out of sequence, it is unfit, as it is written: “And the priest shall write these curses in a scroll” (Numbers 5:23). They must be written in the scroll just as they are written in the Torah.

If one wrote the scroll before the sota accepted the oath upon herself, the scroll is unfit, as it is stated: “Then the priest shall cause the woman to swear with the oath of cursing” (Numbers 5:21), and afterward it states: “And the priest shall write these curses in a scroll” (Numbers 5:23).

If one wrote the scroll as a letter, i.e., without first scoring the lines onto the parchment, it is unfit, as the Merciful One states in the Torah: “In a scroll,” indicating that it must be written like a Torah scroll, in which the parchment must be scored.