Question:

It is Shabbos. Somebody is reading a page that was written (or printed) in ink. He finds an error and crosses it out with a pen.

Does this fall under a specific issur? He hasn’t written anything (כותב), and he has not cleared any space in order to write anything (מוחק).

Answer:

He is transgressing the rabbinic issur of “mekalkel”.

Sources:

Shabbos 106a

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