Leviticus 23:22

ובקצרכם AND WHEN YE REAP [THE HARVEST OF YOUR LAND, THOU SHALT NOT MAKE CLEAR RIDDANCE OF THE CORNER OF THE FIELD] — Scripture repeats the prohibition here (although it has already been mentioned above, 19:9) in order to make one who transgresses this law infringe two negative commands. R. Abdima the son of R. Joseph said: What reason had Scripture to place it (the law concerning the corner of the field) amidst those regarding the festival-sacrifices — those of Passover and Pentecost on this side of it, and those of the New Year, Day of Atonement and “the Feast” (Tabernacles) following on that side of it? To teach you that he who leaves the gleanings, the forgotten sheaf and the corner of the field to the poor as it ought to be, is regarded as though he had built the Temple and offered his sacrifices therein (cf. Sifra, Emor, Chapter 13 11). תעזב THOU SHALT LEAVE [THEM UNTO THE POOR] — leave these in front of them and they shall gather: you are not allowed to assist one of them to the injury of another poor man (Sifra, Kedoshim, Chapter 3 5; Mishnah Peah 5:6). אני ה' אלהיכם I AM THE LORD YOUR GOD, Who am faithful to pay you your reward.

וּֽבְקֻצְרְכֶ֞ם אֶת־קְצִ֣יר אַרְצְכֶ֗ם לֹֽא־תְכַלֶּ֞ה פְּאַ֤ת שָֽׂדְךָ֙ בְּקֻצְרֶ֔ךָ וְלֶ֥קֶט קְצִירְךָ֖ לֹ֣א תְלַקֵּ֑ט לֶֽעָנִ֤י וְלַגֵּר֙ תַּעֲזֹ֣ב אֹתָ֔ם אֲנִ֖י יְהֹוָ֥ה אֱלֹהֵיכֶֽם׃ {פ}

And when you reap the harvest of your land, thou shalt not altogether remove the corners of thy field when thou reapest, nor shalt thou gather any gleaning of thy harvest: thou shalt leave them to the poor, and to the stranger: I am the Lord your God.