In answer to Why do we eat dairy on Shavuos "Monica Cellio" mentions "They just got the laws of kosher slaughter and weren't yet prepared". This is based on the Mishna Berura 494:12. My question on this reason is The Mon started falling on the 16th of Iyar, the year the Jews left Egypt, Rashi Kidushin 38a - 5 lines from the top thus when they came back from receiving the Torah they ate Mon. Then what difference does it make that they were unable to slaughter, they ate Mon?
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1No source is provided, but the halacha yomit email I received seems to say that they specifically ate milchigs on that day "The Mishna Berurah provides another reason for the milchigs. Included in the Aseres Hadibros that Klal Yisrael heard on Shavuos morning, were components of the complete Torah. When the Yidden returned home after Matan Torah, there was not enough time for them to kasher meat in accordance with the many halachos that they had just learned. Therefore, they opted to eat milchigs. Today, we eat milchigs as a reminder of the meal Bnei Yisroel ate that day."– rosendsCommented May 26, 2015 at 15:39
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It's a popular reason due to its "lomdishe" aspect, but I suspect the Mishna Brura brings that reason so people make a lot of pilpul on Shavuos rather than for its plausibility. See here about R. Yakovson's view of that reason.– YishaiCommented May 26, 2015 at 15:52
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3They also had Slav and other animals with them (what did they use for Korbanot?).– Double AA ♦Commented May 26, 2015 at 16:05
1 Answer
It seems, the point maybe in reverse: the custom of eating dairy on the holiday of Shavuos while maintaining all the stringencies of separation between the two is to show the angels that we carefully maintain the halachos of basar becholov. Perhaps, the difficulty of following these rules has motivated the approach that is mentioned in the question.
There is an interesting take regarding the eating the dairy meal given by RaM"A Sh"A O"C 494:3: We have a custom everywhere to eat dairy food on the first day of Shavuot. And it seems to me that the reason is: It is like the two foods that are taken on the evening of Pesach, a reminder of the Korban Pesach and a reminder of the Korban Chagiga, so too we eat a dairy food followed by a meat food, and we bring with them two loaves on the table in place of the Mizbeach, and thus there will be a reminder of the two loaves that were brought on "The day of the Bikkurim."
As we know from Gemara Chulin 105a that one may eat dairy and meat at the same table, although one must eat dairy before meat. We also have many rabbinic restrictions on separation between eating dairy and meat, which need to be carefully followed. For example, one should not have hard or sharp cheeses for dairy, which will require waiting a long period of time after the eating dairy.
There is a midrash Tehilim 8:2 which further corroborates on the point suggested by RaM"A: When Hashem came to give the Torah to Yisroel, the angels were aggravated. Hashem said to them, “Why are you disputing the giving of the Torah? You ate meat with milk in Avraham avinu’s home, as the passuk says: ‘And he took cream and milk and the calf that he had prepared, and he placed [them] before them, ‘ (Bereishis 18:8) while even babies from Yisroel are careful not to eat both together.” And the angels left, rebuked.
The source of this answer is dvar Torah from Dinonline.org.