Keil & Delitzsch

(Heb.: 30:12-13) In order to express the immediate sequence of the fulfilling of the prayer upon the prayer itself, the otherwise (e.g., Psa 32:5) usual ו of conjunction is omitted; on הפכתּ וגו cf. the echoes in Jer 31:13; Lam 5:15. According to our interpretation of the relation of the Psalm to the events of the time, there is as little reason for thinking of Sa2 6:14 in connection with מחול, as of Ch1 21:16 in connection with שׂקּי. In place of the garment of penitence and mourning (cf. מחגרת שׂק, Isa 3:24) slung round the body (perhaps fastened only with a cord) came a girding up (אזּר, synon. חגר Psa 65:13, whence אזור, חגרה) with joy. The designed result of such a speedy and radical change in his affliction, after it had had the salutary effect of humbling him, was the praise of Jahve: in order that my glory (כּבוד for כּבודי = נפשׁי, as in Psa 7:6; Psa 16:9; Psa 108:2) may sing Thy praises without ceasing (ידּם fut. Kal). And the praise of Jahve for ever is moreover his resolve, just as he vows, and at the same time carries it out, in this Psalm.