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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. David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but there was no sword in the hand of David. 1 Samuel 17:49-50
David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him,and cut off his head therewith. 1 Samuel 17:51