The Jewish Calendar and Holidays (incl. Sabbath): Other Holidays and Fasts: Dairy foods on Shavuos:
What is the reason for the custom of eating dairy foods on Shavuos?
(1) The verse that tells us to bring Bikkurim (which
are bought on Shavuos) also forbids mixing meat
and milk, suggesting that both were eaten then
(but not together).
(2) Mt. Sinai is called "Har Gavnunim" (Tehilim 68:16),
and cheese is "Gevinah".
(3) The initial letters of "[Minchah] Chadashah La-Shem
Be-Shavuoseichem" spell "ChaLaV".
(4) The numerical value of Chalav is 40, alluding to the
days Moses spent on the mountain.
If one observes the custom of eating dairy foods on Shavuos,
one should eat a meat meal afterwards.
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