Ezekiel 39:12-16

It will take the Israelites seven months to bury them all in order to cleanse the land. Everyone in Israel will dig their graves, and for this, they will be honored on the day I display my glory, says Lord YAHWEH. And after the seven months are over, men will be appointed to search full time throughout the country to find and bury any remaining corpse of the invaders so that the land will be ritually clean again. And as they go throughout the country, if one of them finds any human bones, he will set up a marker beside them so that the gravediggers can come and bury them in the Valley of Gog’s Army, near the town of Gog’s Army. After that, the land will be ritually clean again.”