1 Samuel 17:55

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

1 Samuel 16:21-22

Then David came to Saul and attended him. Saul loved him greatly and [later] David became his armor bearer.

1 Samuel 17:58

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

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 asked him, “Whose son are you, young man?” And David answered, “I am the son of your servant Jesse of Bethlehem.”
1 Samuel 16:21
Then David came to Saul and attended him. Saul loved him greatly and [later] David became his armor bearer.