5:2 Shalt feed - That is, rule them, and take care of them, as a shepherd doth of his sheep, Psal 78:70,71. This expression, he useth to admonish David, that he was not made a king to advance his own glory, but for the good of his people; whom he ought to rule with all tenderness, and to watch over with all diligence.
5:1-5 David was anointed king a third time. His advances were gradual, that his faith might be tried, and that he might gain experience. Thus his kingdom typified that of the Messiah, which was to come to its height by degrees. Thus Jesus became our Brother, took upon him our nature, dwelt in it that he might become our Prince and Saviour: thus the humbled sinner takes encouragement from the endearing relation, applies for his salvation, submits to his authority, and craves his protection.