וַיַּרְאֵ֗נִי אֶת־יְהוֹשֻׁ֙עַ֙ הַכֹּהֵ֣ן הַגָּד֔וֹל עֹמֵ֕ד לִפְנֵ֖י מַלְאַ֣ךְ יְהוָ֑ה וְהַשָּׂטָ֛ן עֹמֵ֥ד עַל־יְמִינ֖וֹ לְשִׂטְנֽוֹ׃
And he showed me Joshua the high priest standing before the angel of the LORD, and Satan standing at his right hand to accuse him.
Read Jewish philosophical commentary on Zechariah 3:1: and classical philosophical sources.