From Psalms 115:9-11, with the addition, “O house of Levi.”
Related Commentaries of Psalms 135:19
Psalms 135:19-21
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.