Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary

With וייראוּ we are told what will take place when that which is expected in Psa 102:14 comes to pass, and at the same time the fulfilment of that which is longed for is thereby urged home upon God: Jahve's own honour depends upon it, since the restoration of Jerusalem will become the means of the conversion of the world - a fundamental thought of Isa 40:1 (cf. more particularly Isa 59:19; Isa 60:2), which is also called to mind in the expression of this strophe. This prophetic prospect (Isa 40:1-5) that the restoration of Jerusalem will take place simultaneously with the glorious parusia of Jahve re-echoes here in a lyric form. כּי, Psa 102:17, states the ground of the reverence, just as Psa 102:20 the ground of the praise. The people of the Exile are called in Psa 102:18 הערער, from ערר, to be naked: homeless, powerless, honourless, and in the eyes of men, prospectless. The lxx renders this word in Jer 17:6 ἀγριομυρίκη, and its plural, formed by an internal change of vowel, ערוער, in Jer 48:6 ὄνος ἄγριος, which are only particularizations of the primary notion of that which is stark naked, neglected, wild. Psa 102:18 is an echo off Psa 22:25. In the mirror of this and of other Psalms written in times of affliction the Israel of the Exile saw itself reflected.