Four. This does not necessarily mean that they were brothers, but that they were all of the race of the Giant, all Rephaim. The word “four” …

Born to the giant. —They were all descendants of Rapha, but not necessarily all the sons of one man.

These four were born to the giant in Gath
Not to Goliath, for one of them was his brother, but to some giant or anot…

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. …