Sforno on Numbers 11:33/ספורנו על במדבר י״א:ל״ג

1הבשר עודנו בין שניהם, it had not yet even come to the stage when they would despise it and be revolted by it.

2טרם יכרת, the period of one month of which G’d had spoken had not yet elapsed;

3ויך ה' בעם, the ones who had been in the forefront of expressing their lust in order to provoke G’d so that they were punished for their provocation. When G’d had said “they will eat from it for a month,” He had referred only to those members of the people who had cried (crocodile’s tears) without actually having experienced a craving for meat at all. The ones who had said: “why did we leave Egypt?” were the ones who were the first to be punished, even before the meat got into their gullets. The words of verse 20 והיה לכם לזרא were fulfilled by what happened to these people who had pretended by their crying that they felt an overpowering desire for meat.