1 Samuel 17:55

Now when Saul saw David going out against the Philistine, he said to Abner the commander of the army, “Abner, whose son is this young man?” And Abner said, “By your life, O king, I do not know.”

1 Samuel 16:21-22

Then David came to Saul and attended him; and Saul loved him greatly, and he became his armor bearer.

1 Samuel 17:58

Saul said to him, “Whose son are you, young man?” And David answered, “I am the son of your servant Jesse the Bethlehemite.”

Treasury of Scripture Knowledge

Summary

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.

Bible References

Whose son

1 Samuel 17:58
Saul said to him, “Whose son are you, young man?” And David answered, “I am the son of your servant Jesse the Bethlehemite.”
1 Samuel 16:21
Then David came to Saul and attended him; and Saul loved him greatly, and he became his armor bearer.