ANSWER:

This is not authentic and it is a blatant lie. 

I have read in most of the Islamic books and also heard verbally from the deobandi aalims that the Qayamat (dooms day) will come on the 10th of muharram. Is this true from Quran and hadees?

Belief in the Last Day and the Signs of the Hour, Sects | August 13, 2021 2:54 pm
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We fast because of below reason Noah ark was settled on mount Judi Moosa AS saved bani Israel So it’s recommended to fast on 9 and 10 And how is ashoora related to imam Hussain who was martyred
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Consider a shia who believes the Quran is altered because he heard someone say so. He doesn’t believe Ali is God. He lives far away from sunni Muslim areas. He never was presented with evidence. Do we declare this shia as Kafir without giving him a chance to listen to the truth??