And it shall come to pass, if there remain ten men in one house, that they shall die.

Wesley's Notes

6:9 Remain - Escaping the enemies sword. Ten men - Many men, a certain number for an uncertain. They shall die - Tho' they escape a while, they shall not finally escape.

Jamieson-Fausset-Brown Bible Commentary

9. If as many as ten (Le 26:26; Zec 8:23) remain in a house (a rare case, and only in the scattered villages, as there will be scarcely a house in which the enemy will leave any), they shall all, to a man, die of the plague, a frequent concomitant of war in the East (Jer 24:10; 44:13; Eze 6:11).

Matthew Henry's Concise Commentary

6:8-14 How dreadful, how miserable, is the case of those whose eternal ruin the Lord himself has sworn; for he can execute his purpose, and none can alter it! Those hearts are wretchedly hardened that will not be brought to mention God's name, and to worship him, when the hand of God is gone out against them, when sickness and death are in their families. Those that will not be tilled as fields, shall be abandoned as rocks. When our services of God are soured with sin, his providences will justly be made bitter to us. Men should take warning not to harden their hearts, for those who walk in pride, God will destroy.