In Psalm 17:8, David asks God to keep him as the apple of His what?

Answer: Eye

In Psalm 17, "A prayer of David," he asks: "Keep me as the apple of Your eye; hide me in the shadow of Your wings."

“A prayer of David. Hear, O LORD, my righteous plea; listen to my cry. Give ear to my prayer—it comes from lips free of deceit. Keep me as the apple of Your eye; hide me in the shadow of Your wings”— Psalm 17:1, 17:8 (BSB)