II Samuel 21:15-17

When the Philistines were at war again with Israel, David and his servants with him went down and fought against the Philistines; and David grew faint. Then Ishbi-Benob, who was one of the sons of the giant, the weight of whose bronze spear was three hundred shekels, who was bearing a new sword, thought he could kill David. But Abishai the son of Zeruiah came to his aid, and struck the Philistine and killed him. Then the men of David swore to him, saying, “You shall go out no more with us to battle, lest you quench the lamp of Israel.”