15 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 . 16 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 . 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 , " You shall not go out again with us to battle , so that you do not extinguish 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.