Then David ran and stood over the Philistine and took his sword and drew it out of its sheath and killed him and cut off his head with it. When the Philistines saw that their champion was dead, they fled.
Here is 1. The engagement between the two champions, Sa1 17:48. To this engagement the Philistine advanced with a great deal of state and gravity; if he must encounter a pigmy, yet it shall be with the magnificence of a giant and a grandee.
Commenting on 1 Samuel 17:48-58
Therefore David ran and stood upon the Philistine,.... Upon his carcass, as it lay prostrate on the ground, and trampled on him, in just contempt of him who had defied, reproached, and despised the armies of Israel: and took his sword, and drew it out of the sheath thereof; which no doubt was a very large one, and required a good deal of strength to...
cut off his head--not as an evidence of the giant's death, for his slaughter had been effected in presence of the whole army, but as a trophy to be borne to Saul. The heads of slain enemies are always regarded in the East as the most welcome tokens of victory.