Question: Some people have developed an annual tradition on the Day of ‘Aashooraa’ (10th of Muharram) of slaughtering over forty sheep and ewes and over ten cows at the shrines of the so-called Awliyaa’ (pious people). Some ignorant Muslims, who have poor knowledge of the Sharee‘ah (Islaamic law), would gather there and recite the Qur’aan by these graves, claiming that they recite the Qur’aan as a supplication for the dead. They then eat the sacrificed animals. We ask Your Eminence to clarify the legal opinion on this issue supported by proofs from the Qur’aan and the Sunnah.
Answer: First, what you have mentioned in regard to slaughtering sacrifices at the shrines of Awliyaa’ is considered Shirk (associating others with Allaah in His Divinity or worship)… read more here.