The men of Israel said, Have you seen this man who is come up? surely to defy Israel is he come up: and it shall be, that the man who kills him, the king will enrich him with great riches, and will give him his daughter, and make his father's house free in Israel.
It was a trophy that David had, and he wasn't gonna let the thing go. He was gonna carry it around for a few days. Must have been a big head too, you know, the guy's nine foot, six inches tall.