Albert Barnes Commentary 1 Samuel 16:18

"Then answered one of the young men, and said, Behold, I have seen a son of Jesse the Beth-lehemite, that is skilful in playing, and a mighty man of valor, and a man of war, and prudent in speech, and a comely person; and Jehovah is with him." — 1 Samuel 16:18 (ASV)

A mighty valiant man ... - David’s reputation for courage, skill, discretion, and manly beauty was already great. Since the Spirit of the Lord came upon him, his natural qualities and powers had been greatly enhanced. His feat of killing the lion and the bear had been performed, like Samson’s feats of strength (Judges 14:6, 19; 15:14), under the same supernatural influence, and was probably more or less known.