New Revised Standard Version
When Saul saw David go out against the Philistine, he said to Abner, the commander of the army, “Abner, whose son is this young man?” Abner said, “As your soul lives, O king, I do not know.”

Contemporary English Version
After King Saul had watched David go out to fight Goliath, Saul turned to the commander of his army and said, "Abner, who is that young man?" "Your Majesty," Abner answered, "I swear by your life that I don't know."

New American Bible
As Saul watched David go out to meet the Philistine, he asked his general Abner, “Abner, whose son is that young man?” Abner replied, “On your life, O king, I have no idea.”

Douay-Rheims Bible
Now at the time that Saul saw David going out against the Philistines, he said to Abner, the captain of the army: Of what family is this young man descended, Abner? And Abner said: As thy soul liveth, O king, I know not.

Now at the time that Saul saw David going out against the Philistines, he said to Abner, the captain of the army: Of what family is this young man descended, Abner? And Abner said: As thy soul liveth, O king, I know not.

whose son

1 Samuel 17:58 And Saul said to him: Young man, of what family art thou? And David said: I am the son of thy servant Isai the Bethlehemite.

1 Samuel 16:21,22 And David came to Saul, and stood before him: and he loved him exceedingly, and made him his armourbearer. . . .