Sefer HaMitzvot · Positive Commandments, Chapter 120
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היא שצונו להניח פאה מהתבואות והאילנות והדומה להם, והוא אמרו יתעלה תעזוב אותם אחר זכרו הפאה. ונתבאר במסכת מכות (דף ט"ו:) שהפאה היא לאו הנתק לעשה. אמנם הלאו אמרו לא תכלה, והעשה אמרו תעזוב אותם. וכבר התבארו משפטי מצוה זו במסכת פאה, ודין תורה שלא תהא נוהגת אלא בארץ. (קדושים תהיו, מתנות עניים פ"א):
That is that He commanded us to leave over the corner of the produce, the trees and that which is similar to them. And that is His, may He be exalted, saying, "you shall leave them" (Leviticus 19:10), after His mentioning, the corner. And it is explained in Tractate Makkot (Makkot 15b) that the [law of the] corner is a negative commandment that is rectified by a positive commandment. Indeed, the negative commandment is His saying, "you shall not wholly reap" (Leviticus 19:9); and the positive commandment is His saying, "you shall leave them." And the regulations of this commandment have already been explained in Tractate Peah. But by Torah law, it is only practiced in the Land [of Israel]. (See Parashat Kedoshim; Mishneh Torah, Gifts to the Poor 1.)
היא שצונו להניח פאה מהתבואות והאילנות והדומה להם, והוא אמרו יתעלה תעזוב אותם אחר זכרו הפאה. ונתבאר במסכת מכות (דף ט"ו:) שהפאה היא לאו הנתק לעשה. אמנם הלאו אמרו לא תכלה, והעשה אמרו תעזוב אותם. וכבר התבארו משפטי מצוה זו במסכת פאה, ודין תורה שלא תהא נוהגת אלא בארץ. (קדושים תהיו, מתנות עניים פ"א):
That is that He commanded us to leave over the corner of the produce, the trees and that which is similar to them. And that is His, may He be exalted, saying, "you shall leave them" (Leviticus 19:10), after His mentioning, the corner. And it is explained in Tractate Makkot (Makkot 15b) that the [law of the] corner is a negative commandment that is rectified by a positive commandment. Indeed, the negative commandment is His saying, "you shall not wholly reap" (Leviticus 19:9); and the positive commandment is His saying, "you shall leave them." And the regulations of this commandment have already been explained in Tractate Peah. But by Torah law, it is only practiced in the Land [of Israel]. (See Parashat Kedoshim; Mishneh Torah, Gifts to the Poor 1.)