For those days when you need to draw up a legal document and also call down eternal fire upon your enemies. T-S J3.23
On the next page, too, the same person who wrote the fire spell filled in a Judaeo-Arabic spell in the blank space remaining underneath an Aramaic legal formulary.
Is this kind of confirmation a general feature of destructive spells? T-S AS 162.51 is a formulary to "destroy the life" of so-and-so, and someone similarly wrote in, نافع جيد (effective, good).
On that last fragment, check out Gabriele Ferrario's wonderful presentation on Alchemy and Magic: https://www.lib.cam.ac.uk/collections/departments/taylor-schechter-genizah-research-unit/audio-and-video