Square,
Your disrespect is shocking. If the topic doesn’t interest you, don’t post.
This fast is brought in Magen Avraham (??”? ??”? ????)
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Even for those who don’t fast, it is a day that can be spent in teshuva and introspection. Davening for the end to our suffering in golus and the coming of Moshiach.
See Sefer Hasichos 5751 vol. 2 pg. 611