1st Samuel 17:55 And when Saul saw David go forth against the Philistine, he said unto Abner, the captain of the host, Abner, whose son is this youth? And Abner said, As thy soul liveth, O king, I cannot tell.
[Patriarchs & Prophets pp 649] After the slaying of Goliath, Saul kept David with him, and would not permit him to return to his father's house. And it came to pass that “the soul of Jonathan was knit with the soul of David, and Jonathan loved him as his own soul.” Jonathan and David made a covenant to be united as brethren, and the king's son “stripped himself of the robe that was upon him, and gave it to David, and his garments, even to his sword, and to his bow, and to his girdle.”
David was entrusted with important responsibilities, yet he preserved his modesty, and won the affection of the people as well as the royal household. “David went out whithersoever Saul sent him, and behaved himself wisely: and Saul set him over the men of war.” David was prudent and faithful, and it was evident that the blessing of God was with him.
Saul at times realized his own unfitness for the government of Israel, and he felt that the kingdom would be more secure if there could be connected with him one who received instruction from the Lord. Saul hoped also that his connection with David would be a safeguard to himself. Since David was favored and shielded by the Lord, his presence might be a protection to Saul when he went out with him to war.
1st Samuel 17:56 And the king said, Enquire thou whose son the stripling is. 58 And Saul said to him, Whose son art thou, thou young man? And David answered, I am the son of thy servant Jesse the Bethlehemite.
May The Lord add His blessing to the study of His word. God bless!