John Gill Commentary Psalms 18:31

"For who is God, save Jehovah? And who is a rock, besides our God," — Psalms 18:31 (ASV)

For who [is] God save the Lord ?
&c.] 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 ^F14 : the words seem to be taken from, or at least there is in them a reference to, (1 Samuel 2:2) .

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FOOTNOTES:

• F14: (delfiv petra) , Sophoclis Oedipus, v. 472.