18 It came to pass after this, that there was again war with the Philistines at Gob: then Sibbecai the Hushathite killed Saph, who was of the sons of the giant. 19 There was again war with the Philistines at Gob; and Elhanan the son of Jaareoregim the Bethlehemite killed Goliath the Gittite’s brother, the staff of whose spear was like a weaver’s beam. 20 There was again war at Gath, where there was a man of great stature, who had on every hand six fingers, and on every foot six toes, four and twenty in number; and he also was born to the giant. 21 When he defied Israel, Jonathan the son of Shimei, David’s brother, killed him. 22 These four were born to the giant in Gath; and they 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.