Is there a custom to fast on Mondays and Thursdays?

HolidaysFasts & MourningMonday and Thursday Fasts

Synopsis

There is a custom in Ashkenazi and French communities to fast on Mondays and Thursdays, based on concern that festive occasions may lead to sin.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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