Please advise me that we can't take bath on Ashura ? I have heard this from somebody.

It’s not true,we can take bath on the Day of Aashura but if it’s not compulsory a person to have bath (I mean like wajib Ghusl ) then it’s better to avoid it even we should refrain to apply oil in our hair and comb it. In short we should avoid any kind of adornment on the day of Aashura. But make sure these all are not Haram.