Psalms 101:1 - Joseph Benson’s Commentary on the Old and New Testaments

I will sing of mercy and judgment It is doubtful whether David, in thus determining to make mercy and judgment the subjects of his song, intended the mercy which God had shown him, and the judgment which God had executed on his enemies; or the mercy and judgment which he himself purposed to dispense in his dominions, according to the different characters of his subjects. Possibly he might include both, and the purport of his resolution may be this: I will praise thee, O Lord, as for all thy other excellences, so particularly for those two royal perfections of mercy and justice, or judgment, which thou hast so eminently discovered in the government of the world, and of thy people Israel; and I will make it my care to imitate thee, as in other things, so especially in these virtues, which are so necessary for the discharge of my trust, and the good government of thy and my people. “The Psalm,” says Dr. Dodd, “has a double reference, and describes the manner in which David intended to act toward his subjects, under their different denominations, as they were good or bad ones. Toward the faithful in the land he would show חסד, chesed, benignity, and favour; toward the wicked, and such as obstinately violated the laws, he would exercise משׁפשׂ, mishpat, judgment, as he would judge and punish them according to their deeds. And as this was his fixed purpose, he consecrated this song to God; appealing hereby to him for the sincerity of his intention, to make mercy and judgment the great rules of his administration; and agreeably hereto it is observed of him, that he executed justice and judgment to all the people, 2 Samuel 8:15.”