כִּ֤י תִבְצֹר֙ כַּרְמְךָ֔ לֹ֥א תְעוֹלֵ֖ל אַחֲרֶ֑יךָ לַגֵּ֛ר לַיָּת֥וֹם וְלָאַלְמָנָ֖ה יִהְיֶֽה׃
When thou gatherest the grapes of thy vineyard, thou shalt not glean it after thee; it shall be for the stranger, for the fatherless, and for the widow.
Read kabbalistic (mystical) interpretation of Deuteronomy 24:21: and classical mystical sources.