Psalms 135:20 KJV

Bless the Lord, O house of Levi: ye that fear the Lord, bless the Lord.
Psalms 135:20, King James Version

In context

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.