Then Ishbi-benob, a descendant of Rapha, whose bronze spear weighed three hundred shekels and who was bearing a new sword, resolved to kill David.
We have here the story of some conflicts with the Philistines, which happened, as it should seem, in the latter end of David's reign. Though he had so subdued them that they could not bring any great numbers into the field, yet as long as they had any giants among them to be their champions, they would never be quiet, but took all occasions to...
Commenting on 2 Samuel 21:15-22
But Abishai the son of Zeruiah succoured him,.... Observing him in danger, made haste to his relief: and smote the Philistine, and killed him; it seems as if Abishai engaged with the Philistine, and killed him; but inasmuch as it will bear to be interpreted of David, and since the four giants here and hereafter mentioned are said to fall by the hand of David...
And Ishbibenob, which [was] of the sons of the giant, the weight of whose spear [weighed] three hundred [shekels] of brass in weight, he being girded with a new [sword], thought to have slain David. (l) Or, of Haraphah, the race of giants. (m) Which amounts to 9 3/4 pounds.