Thou. Some codices, with Samaritan Pentateuch, Targum of Onkelos, Syriac, Vulgate, read "But thou".
thy brother. The posterity of Esau. Genesis 25:25-30; Obadiah 1:10; Obadiah 1:12.
Related Commentaries of Deuteronomy 23:7
Deuteronomy 23:7
7 Thou shalt not abhor an Edomite; for he is thy brother: thou shalt not abhor an Egyptian; because thou wast a stranger in his land.