Ezekiel 39:14

And they shall sever out men of continual employment, passing through the land to bury with the passengers those that remain upon the face of the earth, to cleanse it: after the end of seven months shall they search.

Cross-reference

In Ezekiel 39:12, seven months of burial cleanse the land; here the appointed buriers carry out that command.

Numbers 19:11–19 Historical context

Numbers 19:11-19 provides the purification ritual for corpse defilement, which underlies the land-cleansing burial process here.