John Gill Commentary Ezekiel 39:15

"And they that pass through the land shall pass through; and when any seeth a man`s bone, then shall he set up a sign by it, till the buriers have buried it in the valley of Hamon-gog." — Ezekiel 39:15 (ASV)

And the passengers that pass through the land Not along with the searchers, but that travel through it upon business in it, or in other lands:

when any sees a man's bone, then shall he set up a sign by it ; as he passes along, if he happens to see a human bone in the way, or hard by, he shall stop and lay a stone, or a heap of stones, by it, or some such mark or token, signifying that a man's bone lies there:

till the buriers have buried it in the valley of Hamon-gog , that is, which sign shall continue till searchers come that way and take up the bone, and carry it to be buried in the valley of Hamon-gog; for carcasses and bones were not to be buried in the place where they were found, but to be brought and interred in this common place of sepulture.