1 Samuel 17:49 in the King James Version
And David put his hand in his bag, and took thence a stone, and slang it, and smote the Philistine in his forehead, that the stone sunk into his forehead; and he fell upon his face to the earth.
Context
48 When the Philistine arose, and walked and came near to meet David, David hurried and ran toward the army to meet the Philistine.
49 David put his hand in his bag, took a stone and slung it, and struck the Philistine in his forehead. The stone sank into his forehead, and he fell on his face to the earth.
50 So David prevailed over the Philistine with a sling and with a stone, and struck the Philistine and killed him; but there was no sword in David’s hand.