2 Samuel 21:16-19

16Then Ishbi-benob, a descendant of Rapha,1 whose bronze spear weighed three hundred shekels2 and who was bearing a new sword, resolved to kill David. 17But Abishai son of Zeruiah came to his aid, struck the Philistine, and killed him.

Then David’s men swore to him, “You must never again go out with us to battle, so that the lamp of Israel may not be extinguished.”

18Some time later at Gob, there was another battle with the Philistines. At that time Sibbecai the Hushathite killed Saph,3 a descendant of Rapha.

19Once again there was a battle with the Philistines at Gob, and Elhanan son of Jair4 the Bethlehemite killed the brother of Goliath5 the Gittite, the shaft of whose spear was like a weaver’s beam.