Keil & Delitzsch

The beginning is taken from Psa 134:1; Psa 135:2 recalls Psa 116:19 (cf. Psa 92:14); and Psa 135:4 is an echo of Deu 7:6. The servants of Jahve to whom the summons is addressed, are not, as in Psa 134:1., His official servants in particular, but according to Psa 135:2, where the courts, in the plural, are allotted to them as their standing-place, and according to Psa 135:19-20, those who fear Him as a body. The threefold Jahve at the beginning is then repeated in Jāh (הללוּ־יהּ, cf. note 1 to PsPsa 104:35), Jahve, and Jāh. The subject of כּי נעים is by no means Jahve (Hupfeld), whom they did not dare to call נעים in the Old Testament, but either the Name, according to Ps 54:8 (Luther, Hitzig), or, which is favoured by Psa 147:1 (cf. Pro 22:18), the praising of His Name (Appolinaris: ἐπεὶ τόδε καλὸν ἀείδειν): His Name to praise is a delightful employ, which is incumbent on Israel as the people of His choice and of His possession.