וַיֹּ֕אמֶר לָכֵ֖ן שְׁמַ֣ע דְּבַר־יְהוָ֑ה רָאִ֤יתִי אֶת־יְהוָה֙ יֹשֵׁ֣ב עַל־כִּסְא֔וֹ וְכָל־צְבָ֤א הַשָּׁמַ֙יִם֙ עֹמֵ֣ד עָלָ֔יו מִימִינ֖וֹ וּמִשְּׂמֹאלֽוֹ׃
И сказал он: 'Послушай слово Господне. Я видел Господа, сидящего на Своем престоле, и все воинство небесное, стоящее рядом с Ним с правой и левой стороны.
The Beginning of Wisdom
16. Scripture states: "All the hosts of heaven stand by Him to His right and to His left." The sages asked, "And are there right and left above? Rather, the right for virtue and the left for guilt." Therefore, a sefirah which influences Kindness to the worthy is allegorically considered "right" and one which influences Judgment upon the guilty is allegorically considered "left".