א"ר יוסי בר אבין שבת ושביעית דאית בהו אבות ותולדות תנא גדול מעשר דלית בה אבות ותולדות לא תנא כלל גדול ולבר קפרא דתני כלל גדול במעשר מאי אבות ומאי תולדות איכא
too, because he wishes to teach another principle, he states, This is a great principle?<span class="x" onmousemove="('comment',' V. Sheb. v, 5 and VII, 1.
');"><sup>6</sup></span> But what of tithes, though 'another principle' is taught, he nevertheless does not teach [elsewhere] 'a great principle'?<span class="x" onmousemove="('comment',' V. Ma'as. I, 1, and II, 7.
');"><sup>7</sup></span> — Said R. Jose b. Abin: As for the Sabbath and shebi'ith, since they possess both primaries and derivatives,<span class="x" onmousemove="('comment',' V. infra 73a seq. Agricultural labour forbidden during the seventh year is likewise divided into primaries and derivatives: sowing, harvesting, reaping and fruit gathering, are primaries, other forms of labour in a field or vineyard are derivatives; v. M.K. 3a.
');"><sup>8</sup></span>
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].
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