Jamieson-Fausset-Brown Bible Commentary

when a man dieth in a tent, &c.--The instances adduced appear very minute and trivial; but important ends, both of a religious and of a sanitary nature, were promoted by carrying the idea of pollution from contact with dead bodies to so great an extent. While it would effectually prevent that Egyptianized race of Israelites imitating the superstitious custom of the Egyptians, who kept in their houses the mummied remains of their ancestors, it ensured a speedy interment to all, thus not only keeping burial places at a distance, but removing from the habitations of the living the corpses of persons who died from infectious disorders, and from the open field the unburied remains of strangers and foreigners who fell in battle.