David being grievously oppressed by the cruelty of his enemies, and apprehending still more mischief, earnestly beseeches God for help. And the more easily to obtain what he asks, after having, by the earnestness of his prayers, manifested the greatness of his grief, he first brings forward the intolerable malice of his enemies, showing how inconsistent it would be with the character of God, were they to be left unpunished. He next speaks of his own faith and patience, and even comfort; having no doubt whatever of a happy issue. Finally, he concludes, that when he shall be delivered, the benefits resulting from his deliverance would not be limited to himself, but would extend to all the godly.
To the chief musician upon Nehiloth. A psalm of David.
Some translate the Hebrew word Nehiloth, heritages, and others, armies. The former assign this reason for their opinion, that David prayed for the welfare of the twelve tribes, whom he calls heritages. The latter assert in support of their view, that being besieged by a vast multitude of men, he betook himself to God for succor; and, according to this sense, the word upon will signify against. But not approving of the conjectures of many who speak upon these inscriptions of The Psalms as if they were riddles, I adopt the opinion of those who hold that it was either a musical instrument or a tune; but of what particular kind I consider it of little importance to ascertain.