Zechariah 3:6 Kabbalah

וַיָּ֙עַד֙ מַלְאַ֣ךְ יְהוָ֔ה בִּיהוֹשֻׁ֖עַ לֵאמֹֽר׃

And the angel of the LORD forewarned Joshua, saying:

Read kabbalistic (mystical) interpretation of Zechariah 3:6: and classical mystical sources.