Question: What is the ruling on sacrificing an animal at a specific date and time every year? Many people believe that slaughtering on the 27th of Rajab, 6th of Safar, 15th of Shawwaal, and 10th of Muharram is an act of ‘Ibaadah (worship) and Qurbah (a good deed by which Allaah’s Pleasure is sought). Are these acts valid? Are they acts of Sunnah or Bid‘ah (innovation in religion) that contradict Islaam and anyone who does them will not be rewarded in return?
Answer: All acts of ‘Ibaadah and Qurbah that draw a Muslim close to Allaah are Tawqeefee (bound by a religious text and not amenable to personal opinion)… read more here.