18 Now it happened afterward that there was again a battle with the Philistines at Gob. Then Sibbechai the Hushathite killed Saph, who was one of the sons of the giant. 19 Again there was war at Gob with the Philistines, where Elhanan the son of Jaare-Oregim the Bethlehemite killed the brother of Goliath the Gittite, the shaft of whose spear was like a weaver's beam. 20 Yet again there was war at Gath, where there was a man of great stature, who had six fingers on each hand and six toes on each foot, twenty-four in number; and he also was born to the giant. 21 So when he defied Israel, Jonathan the son of Shimea, David's brother, killed him. 22 These four were born to the giant in Gath, and fell by the hand of David and by the hand of his servants.
Matthew Henry's Commentary on 2 Samuel 21:18-22
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.