וַיֹּ֕אמֶר לָכֵ֖ן שְׁמַ֣ע דְּבַר־יְהוָ֑ה רָאִ֤יתִי אֶת־יְהוָה֙ יֹשֵׁ֣ב עַל־כִּסְא֔וֹ וְכָל־צְבָ֤א הַשָּׁמַ֙יִם֙ עֹמֵ֣ד עָלָ֔יו מִימִינ֖וֹ וּמִשְּׂמֹאלֽוֹ׃
Da sprach [der Prophet]: Nun denn, höre das Wort des Herrn! Ich habe gesehen den Herrn sitzend auf seinem Thron, und das ganze Heer des Himmels stand um ihn zu seiner Rechten und zu seiner Linken.
Rashi
To His right and to His left. Is there “left” in Heaven? Is it not stated, “The right hand of Adonoy’s is exalted, the right hand of Adonoy performs deeds of valor,”10Tehillim 118:16. [and,] “Your right hand, Adonoy, is adorned with power; Your right hand, Adonoy, crushes the enemy”11Shemos 15:6.? But rather, these are on the right and these are on the left. Those on the right present the case for the defense and those on the left present the case for the prosecution.