To not gather the peret of the vineyard: To not gather the peret of the vineyard, but [rather] to leave them over to the poor, as it is stated (Leviticus 19:10), “and the peret of your vineyard, you shall not gather.” And that is the berries that shed at the time of the reaping of the grapes. And the law is the same for other trees that are similar to a vineyard — that we are obligated not to gather the berries that shed.
From the laws of the commandment is that which they, may their memory be blessed, said (Mishnah Peah 6:5), “Which is fallen grapes? That is one or two [grapes]” that separate from the cluster at the time of the grape harvest. “But three [grapes]” that fell at one time “are not fallen grapes.” If he was harvesting and he threw them to the ground, when he removes the clusters, even half of a cluster that is found [all separated] there is fallen grapes; and so [too,] a whole cluster that separated there, behold it is fallen grapes. And [regarding] the one who places his basket under the vine at the time of the grape harvest — behold, this one robs the poor (Mishnah Peah 7:5). [These] and the rest of its details are in Tractate Peah. (See Tur, Yoreh Deah 332.)
And the content of the commandment, in which place it is practiced and by who — is [all] written above in the commandment of the corner (Sefer HaChinukh 216, 220).
שֶׁלֹּא לִלְקֹט פֶּרֶט הַכֶּרֶם – שֶׁלֹּא לִלְקֹט פֶּרֶט הַכֶּרֶם אֲבָל נַעֲזֹב אוֹתָם לַעֲנִיִּים, שֶׁנֶּאֱמַר (ויקרא יט י) וּפֶרֶט כַּרְמְךָ לֹא תְלַקֵּט. וְהוּא הַגַּרְעִינִים הַנּוֹשְׁרִין בִּשְׁעַת קְטִיפַת הָעֲנָבִים, וְהוּא הַדִּין לִשְׁאָר הָאִילָנוֹת הַדּוֹמִין לַכֶּרֶם, שֶׁנִּתְחַיַּבְנוּ שֶׁלֹּא לִלְקֹט הַגַּרְעִינִין הַנּוֹשְׁרִין. (ריש מ"ע).
To not gather the peret of the vineyard: To not gather the peret of the vineyard, but [rather] to leave them over to the poor, as it is stated (Leviticus 19:10), “and the peret of your vineyard, you shall not gather.” And that is the berries that shed at the time of the reaping of the grapes. And the law is the same for other trees that are similar to a vineyard — that we are obligated not to gather the berries that shed.
רֶמֶז מִשָּׁרְשֵׁי הַמִּצְוָה. כְּעִנְיָן שֶׁכָּתַבְנוּ לְמַעְלָה בְּפֵאָה (מצוה רטז).
A hint of the roots of the commandment is like the matter that I wrote above about the corner (Sefer HaChinukh 216).
מִדִּינֵי הַמִּצְוָה. מָה שֶׁאָמְרוּ זִכְרוֹנָם לִבְרָכָה (פאה ו, ה) אֵיזֶהוּ פֶּרֶט? זֶה גַּרְגֵּר אֶחָד אוֹ שְׁנֵי גַּרְגְּרִים הַנִּפְרָטִים מִן הָאֶשְׁכֹּל בִּשְׁעַת הַבְּצִירָה, אֲבָל שְׁלֹשָׁה גַּרְגְּרִין שֶׁנָּפְלוּ בְּבַת אַחַת אֵינוֹ פֶּרֶט. הָיָה בּוֹצֵר וּמַשְׁלִיךְ לָאָרֶץ כְּשֶׁמְּפַנֶּה הָאֶשְׁכּוֹלוֹת אֲפִלּוּ חֲצִי אֶשְׁכֹּל הַנִּמְצָא שָׁם פֶּרֶט, וְכֵן אֶשְׁכֹּל שָׁלֵם שֶׁנִּפְרַט שָׁם הֲרֵי הוּא פֶּרֶט. וְהַמַּנִּיחַ אֶת הַכַּלְכָּלָה תַּחַת הַגֶּפֶן בְּשָׁעָה שֶׁבּוֹצֵר הֲרֵי זֶה גּוֹזֵל אֶת הָעֲנִיִּים (פאה ז ה). וְיֶתֶר פְּרָטֶיהָ, בְּמַסֶּכֶת פֵּאָה [יו"ד סימן שלב].
From the laws of the commandment is that which they, may their memory be blessed, said (Mishnah Peah 6:5), “Which is fallen grapes? That is one or two [grapes]” that separate from the cluster at the time of the grape harvest. “But three [grapes]” that fell at one time “are not fallen grapes.” If he was harvesting and he threw them to the ground, when he removes the clusters, even half of a cluster that is found [all separated] there is fallen grapes; and so [too,] a whole cluster that separated there, behold it is fallen grapes. And [regarding] the one who places his basket under the vine at the time of the grape harvest — behold, this one robs the poor (Mishnah Peah 7:5). [These] and the rest of its details are in Tractate Peah. (See Tur, Yoreh Deah 332.)
וְעִנְיַן הַמִּצְוָה בְּאֵיזֶה מָקוֹם נוֹהֶגֶת וּבְמִי, כָּתוּב לְמַעְלָה בְּמִצְוַת פֵּאָה (מצוה רטז רכ).
And the content of the commandment, in which place it is practiced and by who — is [all] written above in the commandment of the corner (Sefer HaChinukh 216, 220).