Psalms 135:20 Midrash

בֵּ֣ית הַ֭לֵּוִי בָּרֲכ֣וּ אֶת־יְהוָ֑ה יִֽרְאֵ֥י יְ֝הוָ֗ה בָּרֲכ֥וּ אֶת־יְהוָֽה׃

O house of Levi, bless ye the LORD; Ye that fear the LORD, bless ye the LORD.

Read midrashic interpretation of Psalms 135:20: and classical rabbinic exegesis.