ANSWER:

All what they say is baseless. 

The only reason why we fast the 10th day of muharram is because Allah saved Musa alayhissalam from Pharoah and his people. 

We have been hearing that the 10th of Muharram is a very significant day according to Islamic calendar. It said that many incidents took place on the 10th- around 13 events + many more. But never heard of any authentic references either from the Qur’an or Hadith. Please shed some light on this subject.

Fasting | September 15, 2019 9:00 pm
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I did fast on 9th and 10th of muharram, so my missed fast from ramazan has also been counted ?
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My brother passed away this past July. I know we can make dua and fast on behalf of the deceased. My question is I’ve fasted on the day of Ashoora on his behalf. Will he get the reward of sin being wiped away from previous year? Of course sins being forgiven for the following year wouldn’t count because he is no longer in this world.