6. unclean thing—legally unclean, as a leper. True of Israel, everywhere now cut off by unbelief and by God's judgments from the congregation of the saints.
righteousness—plural, "uncleanness" extended to every particular act of theirs, even to their prayers and praises. True of the best doings of the unregenerate (Php 3:6-8; Tit 1:15; Heb 11:6).
filthy rags—literally, a "menstruous rag" (Le 15:33; 20:18; La 1:17).
fade … leaf—(Ps 90:5, 6).