III. He promises that he would make the Israelites masters of all those countries that were yet unsubdued, though Joshua was old and not able to do it, old and not likely to live to see it done. Whatever becomes of us, and however we may be laid aside as despised broken vessels, God will do his own work in his own time (v. 6): I will drive them out. The original is emphatic: "It is I that will do it, I that can do it when thou are dead and gone, and will do it if Israel be not wanting to themselves." "I will do it by my Word," so the Chaldee here, as in many other places, "by the eternal Word, the captain of the hosts of the Lord." This promise that he would drive them out from before the children of Israel plainly supposes it as the condition of the promise that the children of Israel must themselves attempt their extirpation, must go up against them, else they could not be said to be driven out before them; if afterwards Israel, through sloth, or cowardice, or affection to these idolaters, sit still and let them alone, they must blame themselves, and not God, if they be not driven out. We must work out our salvation, and then God will work in us and work with us; we must resist our spiritual enemies, and then God will tread them under our feet; we must go forth to our Christian work and warfare, and then God will go forth before us.