David took his sword; hence it appears that David was not a little man, as many fancy; but a man of considerable bulk and strength, because he was able to manage a giant's sword; which also he did, both here and below, 1 Samuel 21:9. Slew him. Quest. How could this be, when he slew him before with the stone? 1 Samuel 17:50. Answ. There he gives a general account of the event of the battle, and of the giant's death; but here he gives a particular relation of the manner and instrument of his death. The stone threw him down to the earth, and bereaved him of the use of his sense and motion; but there remained some life in him, (as frequently doth in such cases,) which the sword took away, and so completed the work.
Related Commentaries of 1 Samuel 17:51
1 Samuel 17:51
51 Therefore David ran, and stood upon the Philistine, and took his sword, and drew it out of the sheath thereof, and slew him, and cut off his head therewith. And when the Philistines saw their champion was dead, they fled.