Is it permitted to fast on Isru Chag (the day after) Shavuot?
Synopsis
The Mechaber prohibits fasting on Isru Chag of Shavuot. The Magen Avraham explains this is because when Shavuot fell on Shabbat, sacrifices were offered the next day, giving it a quasi-Yom Tov status. The Biur HaGra implies the prohibition extends to Isru Chag of Sukkot as well.
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