What does Ezekiel 39:14 mean?

After those seven months, people will keep searching for any bones left behind, to make sure the land stays clean. They’ll have people assigned to travel around and mark any bones they find, so they can be buried in the Valley of Gog’s Army. Ezekiel 39:14 - Modern Text Bible

(Even after the main burial, there’s ongoing effort to purify the land, showing the importance of holiness and order.)