1 Samuel 21:8 - Ellicott's Commentary On The Whole Bible

Spear or sword? — We may well suppose to what David pointed when he made his request — the famous sword, the trophy of the combat which had for ever made his name illustrious. In the first flush of gratitude to the invisible One who had stood by him in the hour of peril, he had doubtless taken and presented to the sanctuary guardians, as an offering to be kept for ever, a memorial of the victory of Israel over the uncircumcised; but now, in his hour of need and humiliation, he needed all the credentials he could gather together of his ability and power to lead men, so he trusts the priest will let him have his glorious prize back again. This seems to have been really the meaning of his petition to Ahimelech, and so evidently the priest understood David, for at once he suggested restoring the well-known, treasured sword. The sanctuary, he said, possesses no war weapon but that one which hangs up among us, a votive offering.