15 There was war again between the Philistines and Israel, and David went down together with his servants, and they fought against the Philistines. And David grew weary. 16 And Ishbi-benob, one of the descendants of the giants, whose spear weighed three hundred shekels[1] of bronze, and who was armed with a new sword, thought to kill David. 17 But Abishai the son of Zeruiah came to his aid and attacked the Philistine and killed him. Then David's men swore to him, "You shall no longer go out with us to battle, lest you quench the lamp of Israel."
Matthew Henry's Commentary on 2 Samuel 21:15-17
Commentary on 2 Samuel 21:15-22
(Read 2 Samuel 21:15-22)
These events seem to have taken place towards the end of David's reign. David fainted, but he did not flee, and God sent help in the time of need. In spiritual conflicts, even strong saints sometimes wax faint; then Satan attacks them furiously; but those who stand their ground and resist him, shall be relieved and made more than conquerors. Death is a Christian's last enemy, and a son of Anak; but through Him that triumphed for us, believers shall be more than conquerors at last, even over that enemy.