Numbers 11:19

You shall not eat it one day, nor two days, nor five, nor ten, nor twenty days;

YE SHALL NOT EAT ONE DAY. The meaning thereof is: “you shall not eat for only one day, nor only two days [but even a whole month]. Similarly, the phrase not once nor twice means “not only once nor twice.” And in my opinion it cannot be said of a person who eats or does something for many consecutive days that he ate or did [that action] for one day. is to be understood literally, for since they will eat for a consecutive period of thirty days, it cannot be said of them that they ate for one day. Likewise the phrase nor twenty days is to be understood in its plain sense: “you will not eat of it twenty days, but thirty days.” Similarly it cannot be said of one who eats [something] for thirty consecutive days that he ate it for twenty days. is to be understood literally, for since they will eat for a consecutive period of thirty days, it cannot be said of them that they ate for one day. Likewise the phrase nor twenty days is to be understood in its plain sense: “you will not eat of it twenty days, but thirty days.” Or it may be that the word “one” [Ye shall not eat ‘one’ day] is connected [with the following phrases]: “Ye shall not eat one day, nor two days, nor ten or twenty single [non-consecutive] days, but a full month.” Thus He gave them the meat which they craved for, but not the fish or the vegetables, for their main demand for which they wept was give us flesh. And the meaning of the expression, But even a whole month, until it come out of your nostrils, and it be loathsome unto you is that He will give them a lot of meat, and they will eat it for a whole month to such a great extent that they will become sick of it, and they will consider it detestable and like a strange inedible food.
According to the plain meaning of Scripture the following is what happened: On the first day [of their eating the meat] they were smitten with a very great plague and the people that were the first to lust died,, Verse 34. these being the mixed multitude that was among them, also the children of Israel mentioned at the beginning who said, Who shall give us flesh to eat? But the rest of the people who wept afterwards family by family, every man at the door of his tent, Verse 10. ate of it for a whole month until it became loathsome to them and they threw away any heaps they had left of it. And so does the psalm state: …

לא יום אחד ....ולא עשרים יום, “not one day or even not twenty days, etc.” Why did the Torah have to give us all these details, instead of simply writing that the people got quails lasting for thirty days? The days listed by the Torah here have to be viewed cumulatively, so that the quail episode extended for a period of 67 days. In the Jewish calendar year there are a total of 67 days which are holidays, i.e. the Sabbath days and the festivals. [This applies when the year has 354 days, seeing that it does not always have the same number of days. Ed.] The message is that on each of these days the consumption of meat is a mitzvah; on other days meat consumed on these days may have negative effects, as opposed to meat consumed in honour of the Sabbath or a festival. Personally, I prefer to understand the expression: לא יום אחד, “not one day, that there is one of those days, i.e. the Day of Atonement on which consumption of meat is forbidden. [The author continues in a somewhat forced manner to find justifications for each individual number listed. Since he has to resort to numbers which are appropriate only for the additional days for a festival observed in the Diaspora, and since at the same time he does not consider Purim as a day deserving be honoured by the eating of meat, I decided to skip this. Ed.]