Or HaChaim on Numbers 33:56/אור החיים על במדבר ל״ג:נ״ו

1 כאשר דמיתי לעשות להם, "as I meant to do unto them, etc." My commandment was meant for your benefit. Seeing you have not fulfilled it, My commandment remains unfulfilled; I therefore have no choice but to fulfil it in respect of these people you have left in the land.