18 I denounce to you this day, that you shall surely perish; you shall not prolong your days in the land, where you pass over the Jordan to go in to possess it.
*Minor differences ignored. Grouped by changes, with first version listed as example.
I denounce unto, you this day that ye shall surely perish,.... By one judgment or another; this he most solemnly averred, and it might be depended upon that it would certainly be their case; see Deuteronomy 4:26,
and that ye shall not prolong your days upon the land, whither thou passest over Jordan to go to possess it; but be cut short by death, of one kind or another, by sword, or famine, or pestilence, or be carried into captivity; one or other of which were frequently their case.
As Deuteronomy 4:26; Deuteronomy 8:19. He calls upon heaven and earth as witnesses (Deuteronomy 30:19, as in Deuteronomy 4:26), namely, that he had set before them life and death. וּבחרתּ, in Deuteronomy 30:19, is the apodosis: "therefore choose life."
*More commentary available at chapter level.