Psalm 18:31
For who is God save the LORD? or who is a rock save our God?
For 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} delfiv petra, Sophoclis Oedipus, v. 472.