Zechariah 3:3 - Albert Barnes' Notes on the Bible

Now Joshua was clothed with filthy garments - Such, it is expressed, was his habitual condition; he was one so clothed. The “filthy garment,” as defilement generally, is, in Scripture, the symbol of sin. “We are all as the unclean, and all our righteousnesses are as filthy rags” Isaiah 64:6. “He that is left in Zion and he that remaineth in Jerusalem shall be called holy - when the Lord shall have washed away the filth of the daughters of Zion” Isaiah 4:3-4. “There is a generation, pure in its own eyes, and it is not washed from its filthiness” Proverbs 30:12. The same is expressed by different words, signifying pollution, defilement by sin; “Woe unto her that is filthy and polluted” Zephaniah 3:1; “The land was defiled with blood” Psalms 106:38; “they were defiled with their own works”. It is symbolized also by the “divers washings” Hebrews 9:10 of the law, representing restored purity; and the use of the word by Psalmists and prophets; “Wash me thoroughly from mine iniquity” Psalms 51:4; “wash you, make you clean; put away the evil of your doings from before Mine eyes” Isaiah 1:16; “O Jerusalem, wash thy heart from wickedness” Jeremiah 4:14. In later times at least, the accused were clothed in black , not in defiled garments.