2 Samuel 21:15-17

Now when the Philistines were at war again with Israel, David went down and his servants with him; and as they fought against the Philistines, David became weary. Then Ishbi-benob, who was among the descendants of the giant, the weight of whose spear was three hundred shekels of bronze in weight, was girded with a new sword, and he intended to kill David. But Abishai the son of Zeruiah helped him, and struck the Philistine and killed him. Then the men of David swore to him, saying, “You shall not go out again with us to battle, so that you do not extinguish the lamp of Israel.”