אב מלאכה ומלאכה העושה מלאכות הרבה מעין מלאכה אחת אינו חייב אלא חטאת אחת:
PRIMARY LABOUR.<span class="x" onmousemove="('comment',' The general principle is this: a sin-offering in connection with the Sabbath is incurred for every unwitting transgression. The number of transgressions is determined by the number of unknown facts. Thus, when one is ignorant of the Sabbath law altogether, he is unaware of a single fact, and incurs one sin-offering only. If he forgets a number of Sabbaths, each is a separate fact; hence he is liable for each. If he knows that it is the Sabbath but forgets that certain labours are forbidden, each labour is a separate fact, and he is liable for each separately. — For primary (Heb. ab, lit., 'father') labours v. p. 3, n. 2.
');"><sup>1</sup></span> HE WHO PERFORMS MANY LABOURS BELONGING TO THE SAME CATEGORY OF WORK<span class="x" onmousemove="('comment',' I.e., all derivatives (toledoth) of the same primary labour (ab).
');"><sup>2</sup></span> IS LIABLE TO ONE SIN-OFFERING ONLY.
Rashi on Shabbat
They teach in the Mishna: to exempt with only one sin offering. An infant who was captured: and who never knew anything about Shabbat. But one who was familiar [with Shabbat] and ended up forgetting: he is like one who forgets that the day is Shabbat while knowing the essence of Shabbat, and is obligated for each and every Shabbat. That it was forcibly forgotten from him: he never knew.
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Tosafot on Shabbat
A convert who converted among the Gentiles: before three [a beit din] and they did not inform him of the mitzvah of Shabbat; for if he had only converted by himself he would not be a convert (as they discuss in Yevamot 47b).
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Rashi on Shabbat
Let it teach "one who was familiar and ended up forgetting:" that he is obligated even though one can't declare that during the days in between [one Shabbat and the next] he had awareness to divide [one violation from the next]; and how much more so would one who does have awareness to divide [between one Shabbat and the next] [be obligated for each and every Shabbat he violated].
