2 Samuel 21:17 in the King James Version
But Abishai the son of Zeruiah succoured him, and smote the Philistine, and killed him. Then the men of David sware unto him, saying, Thou shalt go no more out with us to battle, that thou quench not the light of Israel.
Context
16 and Ishbibenob, who was of the sons of the giant, the weight of whose spear was three hundred shekels of bronze in weight, he being armed with a new sword, thought he would kill David.
17 But Abishai the son of Zeruiah helped him, and struck the Philistine and killed him. Then the men of David swore to him, saying, “Don’t go out with us to battle any more, so that you don’t quench the lamp of Israel.”
18 After this, there was again war with the Philistines at Gob. Then Sibbecai the Hushathite killed Saph, who was of the sons of the giant.