Reference

Psalms 135:20

Bless the Lord, O house of Levi: ye that fear the Lord, bless the Lord.
18

They that make them are like unto them: so is every one that trusteth in them.

19

Bless the Lord, O house of Israel: bless the Lord, O house of Aaron:

20

Bless the Lord, O house of Levi: ye that fear the Lord, bless the Lord.

21

Blessed be the Lord out of Zion, which dwelleth at Jerusalem. Praise ye the Lord.