Commentary for Jeremiah 9:3

אִ֤ישׁ מֵרֵעֵ֙הוּ֙ הִשָּׁמֵ֔רוּ וְעַל־כָּל־אָ֖ח אַל־תִּבְטָ֑חוּ כִּ֤י כָל־אָח֙ עָק֣וֹב יַעְקֹ֔ב וְכָל־רֵ֖עַ רָכִ֥יל יַהֲלֹֽךְ׃

Take ye heed every one of his neighbour, And trust ye not in any brother; For every brother acteth subtly, And every neighbour goeth about with slanders.

Rashi on Jeremiah