Psalm 135:1-3, 19-20

Praise ye the LORD. Praise ye the name of the LORD; Praise him, O ye servants of the LORD. Ye that stand in the house of the LORD, In the courts of the house of our God, Praise the LORD; for the LORD is good: Sing praises unto his name; for it is pleasant.

Bless the LORD, O house of Israel: Bless the LORD, O house of Aaron: Bless the LORD, O house of Levi: Ye that fear the LORD, bless the LORD.