Question: Is it haram or makrooh (reprehensible) to work on Ashura, Tasooa, and the days of the martyrdom of the Ahlulbayt (as)?
Answer: It is befitting for shopkeepers to shut down their shops and close their businesses on the occasion of the martyrdom of the Ahlul-Bayt, peace be upon them. In fact, if keeping shops open is considered disrespectful to the Ahlul-Bayt, peace be upon them, it is necessary to avoid doing so.
Ayatollah Al-Sayyid Ali Al-Husseini Al-Sistani