Psalms 50:5 - Ellicott's Commentary On The Whole Bible

My saints. — This verse is of great importance, as containing a formal definition of the word chasîdîm, and so a direction as to its interpretation wherever it occurs in the Hebrew hymn book. The “saints” are those in the “covenant,” and that covenant was ratified by sacrifices. As often, then, as a sacrifice was offered by an Israelite, it was a witness to the existence of the covenant, and we are not to gather, therefore, from this psalm that outward acts of sacrifice were annulled by the higher spirit taught in it; they were merely subordinated to their proper place, and those who thought more of the rites that bore testimony to the covenant than of the moral duties which the covenant enjoined, are those censured in this part of the psalm.