And he set. — Stationed, or appointed.
At the gates. — Or, over the gates. (See 1 Chronicles 23:5; 1 Chronicles 26:1-19.)
That none which was unclean... should enter. — Comp. 2 Chronicles 23:6, and Leviticus 5:7; Numbers 5:19; Deuteronomy 24:1-3; Deuteronomy 24:10-11.