If you do thus, (Devarim 11:17) "the wrath of the L-rd will burn against you." An analogy: A father sent his son to a feast, instructing him: Do not eat more than you need and do not drink more than you need, so that you return clean to your home. The son did not heed his father's words, but ate and drank more than he needed, and he vomitted and sullied his fellows, who took him by his hands and feet and flung him behind the mansion. Thus, the Holy One Blessed be He says to Israel: I have brought you to a good, broad land, a land flowing with milk and honey, to eat of its fruits and to be sated with its good, and to bless My name upon it. You were not with the good — be with the penalty: "The wrath of the L-rd will burn against you!"