(31) Comp. Deuteronomy 32:31, where we see that "rock" was a common term among the tribes of Canaan for their divinities. Notice some trifling variations in Samuel.

Verse 31. - For who is God save the Lord (see Exodus 20:3; Deuteronomy 32:39). As the one and only God, absolute confidence may be placed in Jehovah, who is able to protect and preserve to the uttermost all who serve him (comp. 2 Samuel 7:22-29). Or who is a Rock save our God? (comp. ver. 2; and see also Deuteronomy 32:4, 18, 30, 31; and Psalm 61:2).

18:29-50 When we praise for one mercy, we must observe the many more, with which we have been compassed all our days. Many things had contributed to David's advancement, and he owns the hand of God in them all, to teach us to do likewise. In verseFor who is God save the Lord?.... Or Jehovah: there is but one God, and Jehovah is he; there is none besides him, nor any like him: there are many that are called gods, nominal deities, who are not by nature gods; fictitious ones, the idols of the Gentiles, made of gold, silver, brass, wood, and stone; but there is but one true God: there are gods, in an improper sense, as civil magistrates; but there is none really and truly so but the Lord; which is to be understood, not of Jehovah the Father, to the exclusion of the Son and Spirit; for the Son is Jehovah, and the Spirit is Jehovah; both are so called, as well as the Father, and all three one God;

or who is a rock save our God? to have recourse to for shelter and protection; or to trust to, and build upon, for eternal life and salvation. False gods are rocks; but not like ours, our enemies themselves being judges, Deuteronomy 32:31; so Apollo at Delphos is called the Delphian rock (n): the words seem to be taken from, or at least there is in them a reference to, 1 Samuel 2:2.

(n) , Sophoclis Oedipus, v. 472.