If there remain ten men in one house. If these escape death in war, they shall die of famine and pestilence in the three years' siege of Samaria (2 Kings 17:5). If the prophet is still referring to the rich chieftains, ten would be only a poor remnant of the inhabitants of their palaces.
The LXX. adds, very unnecesarily, καὶ ὑπολειφθήσονται οἱ κατάλοιποι, "And those remaining shall be left behind."