Rashi on Deuteronomy 11:17/רש"י על דברים י״א:י״ז

1את יבולה [THE GROUND WILL NOT GIVE] ITS יבול — it will not yield even as much as what you have brought (יבול) to it (even the same quantity of seed you have sown in it), just as it is said, (Hag. 1:6) “You sow much, but bring in little” (Sifrei Devarim 43:28; cf. Rashi on Leviticus 26:20).

2ואבדתם מהרה AND YE SHALL PERISH QUICKLY — In addition to all the other sufferings I will banish you from the soil which made you sin (Sifrei Devarim 43:29). A parable! It may be compared to the case of a king who sent his son to the banqueting hall and earnestly charged him, “Do not eat more than you need, in order that you may come home clean!” The son, however, took no notice of this; he ate and drank more than he needed, and vomited it up and befouled all the company. They took him by his hands and feet and cast him out of the palace (Sifrei Devarim 43:23).

3מהרה [AND YE SHALL PERISH] QUICKLY — I will give you no respite. But if you ask: Was not respite given to the generation of the flood, as it is said, (Genesis 6:3) “His days shall be (i.e. a respite shall be given him for) one hundred and twenty years”? Then I reply: The generation of flood had no one from whom to learn, but you have someone from whom to learn (Sifrei Devarim 43:31).