Deuteronomy 27:19 Midrash

אָר֗וּר מַטֶּ֛ה מִשְׁפַּ֥ט גֵּר־יָת֖וֹם וְאַלְמָנָ֑ה וְאָמַ֥ר כָּל־הָעָ֖ם אָמֵֽן׃ (ס)

Cursed be he that perverteth the justice due to the stranger, fatherless, and widow. And all the people shall say: Amen.

Read midrashic interpretation of Deuteronomy 27:19: and classical rabbinic exegesis.