1 Samuel 16:18

Then answered one of the servants, &c. It is likely this was some friend or acquaintance of David, who here gives him a very high character, which he did not disgrace, but fully verified, insomuch that Saul for a time highly esteemed him, finding him amiable in his spirit, and prudent in matters, and therefore useful to him in many other ways, as well as by his skill in music. We need not wonder that David was so suddenly advanced from a poor shepherd to so great a reputation; for this was the effect of those graces and gifts of the Divine Spirit which he had received when he was anointed. The Lord is with him Said the servant; that is, directs and prospers all his undertakings.