Fasting on the day of Aashoora (10th Muharram)

[khoji]

Re: Fasting on the day of Aashoora (10th Muharram)

@khoji

It is strange that the Prophet would make it a day of celebrations when later on his own grandson was to be killed along with all his male family members and women of Prophet’s own family enslaved.
Hussain, son of Ali and Fatima, a member of ahle bait, whom he called ‘sayyed a shabab e jannat’.

So what is this rejoicing about?

I would like someone to comment on the post above. Why would Prophet rejoicing on a day when his grandson was to be killed later along with his own family?