Komentarz do Powtórzonego Prawa 32:22

קדחה means, IT BURNS.

כי אש קדחה באפי, for when I disciplined them in order to induce them to repent their sins this people lit a fire in My wrath ותיקד עד שאול תחתית, they heaped sin upon sin until My wrath burned to the very bottom of Sheol, (lowest layer of purgatory). In other words, their punishment would consist of being consigned to this lowest region of purgatory. (compare Chronicles II 28,22 describing Achaz adding sins as a result of his kingdom having been severely chastised by G’d.)

Down to the foundation. He added the words “you” and “your land” for without this we would not know who would be burned or which land.