Ezekiel 39:9

And they that dwell in the cities of Israel. shall go forth, the Lord's children taking a walk, as it were, to take a look at the fallen enemies, and shall set on fire and burn the weapons, the armor of the enemies, both the shields and the bucklers, the enemies weapons of defense, the bows and the arrows, the weapons of offense, and the band-staves, which some commentators think were the riding-switches of the invaders, and the spears, and they shall burn them with fire seven years, this number being used as the holy number of the Bible.