Psalms 5:1

The title of this psalm has nothing in it peculiar but that it is said to be upon Nehiloth, a word nowhere else used. It is conjectured (and it is but a conjecture) that is signifies wind - instruments, with which this psalm was sung, as Neginoth was supposed to signify the stringed - instruments. In these verses David had an eye to God, I. As a prayer-hearing God; such he has always been ever since men began to call upon the name of the Lord, and yet is still as ready to hear prayer as ever. Observe how David here styles him: O Lord (Psa 5:1, Psa 5:3), Jehovah, a self-existent, self-sufficient, Being, whom we are bound to adore, and, "my King and my God (Psa 5:2), whom I have avouched for my God, to whom I have sworn allegiance, and under whose protection I have put myself as my King." We believe that the God we pray to is a King, and a God. King of kings and God of gods; but that is not enough: the most commanding encouraging principle of prayer, and the most powerful or prevailing plea in prayer, is to look upon him as our King and our God, to whom we lie under peculiar obligations and from whom we have peculiar expectations. Now observe, 1. What David here prays for, which may encourage our faith and hopes in all our addresses to God.

— Matthew Henry's Concise Commentary (public domain)