As Saul had watched David going out to confront the Philistine, he said to Abner the commander of the army, "Abner, whose son is this young man?" "As surely as you live, O king," Abner replied, "I do not know."

Genesis 42:15
And this is how you will be tested: As surely as Pharaoh lives, you shall not leave this place unless your youngest brother comes here.

1 Samuel 16:12
So Jesse sent for his youngest son and brought him in. He was ruddy, with beautiful eyes and a handsome appearance. And the LORD said, "Rise and anoint him, for he is the one."

1 Samuel 16:21
When David came to Saul and entered his service, Saul admired him greatly, and David became his armor-bearer.

1 Samuel 17:54
David took the head of the Philistine and brought it to Jerusalem, and he put Goliath's weapons in his own tent.

1 Samuel 17:56
"Find out whose son this young man is!" said the king.

1 Samuel 26:5
Then David set out and went to the place where Saul had camped. He saw the place where Saul and Abner son of Ner, the general of his army, had lain down. Saul was lying inside the inner circle of the camp, with the troops camped around him.

And when Saul saw David go forth against the Philistine, he said to Abner, the captain of the host, Abner, whose son is this youth? And Abner said, As your soul lives, O king, I cannot tell.