Reference for Avodah Zarah 30:4

מתקיף לה רב אשי וכל היכא דאין אדם מצווה שרי והרי כלים דאין אדם מצווה על שביתת כלים בשביעית ותנן אלו הן כלים שאין אדם רשאי למוכרן בשביעית המחרישה וכל כליה העול והמזרה והדקר

Ashi objected: And in any case where a person is not commanded [concerning a thing] he is permitted [to sell it to one who will not observe the prohibition]? Take then the case of implements, for one is not commanded to let one’s implements rest in the Sabbatical year. Yet we have learned: The following are the implements which one is not allowed to sell in the Sabbatical year: the plough and all its accessory vessels, the yoke, the winnowing-fan and the mattock!

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