12
" The allegorical meaning of the death of Moses and the appointment of Joshua has been touched upon above;1 therefore it is to be repeated here but briefly. Moses is the minister of the Law, which does not lead to fulfillment, that is, to righteousness, but shows sin and demands grace, which it does not confer. Therefore he dies and stays on this side of Jordan in the land of Moab, that is, in the righteousness of works. Joshua succeeds him as leader; this is the ministry of grace. He leads the people into the Land of Promise, that is, to true righteousness in Christ; and the Israelites cross over the Jordan dry-shod, that is, as both sin and death draw back and yield to grace. "
― Martin Luther , Lectures on Deuteronomy
20
" Again you will note here especially that the nation of Israel is wholly indistinguishable from those Gentiles who are to be destroyed, except for the distinction of faith, just as he says here that they will perish like those Gentiles whom the Lord will destroy before them. Therefore they have nothing of which to boast against the Gentiles — not the Law, the righteousness of works, the blood of the fathers, the miracles of God, the divine sayings, the priesthood, the kingdom, or anything else. The sentence stands: If they forget God and worship other gods, they shall perish, as if all this were nothing and they themselves were Gentiles too. For he who does not believe will be damned (Mark 16:16). But it has been said enough: “To worship strange gods is to be unbelieving and to oppose the true God. "
― Martin Luther , Lectures on Deuteronomy