Question 27: What is the ruling on making Sujood (Prostration) and slaughtering animals on graves?
Answer: Making Sujood (Prostration) and slaughtering animals at graves are idolatrous habits and acts of Shirk Akbar (major form of associating others in worship with Allaah). Sujud and slaughtering are acts of `Ibaadah (worship) and `Ibaadah should be exclusively confined to Allaah. Thus, whoever performs any of them to anyone other than Allaah commits an act of disbelief. Allaah (the Exalted) says… read more here.