Ezekiel 39:12
For seven months the house of Israel will be burying them in order to cleanse the land.
Deuteronomy 21:23
his body shall not hang all night on the tree, but you shall most certainly bury him on the same day (for he who is hanged is cursed by God), so that you do not defile your land which the Lord your God gives you as an inheritance.
Ezekiel 39:14
“They will elect men who will constantly go through the land, [men commissioned] to bury those who were passing through, those bodies that lie unburied on the surface of the ground, in order to cleanse it. At the end of seven months they will do a search.
Ezekiel 39:16
And even the name of the city will be Hamonah. In this manner they shall cleanse the land.”’
Numbers 19:16
Also, anyone in the open field who touches one who has been killed with a sword or who has died [of natural causes], or a human bone or a grave, shall be unclean for seven days.