Question: There is a grave of a Walee (pious person) at which people offer sacrificial animals every year. They do so with the intention of saying supplication and giving charity on behalf of the dead. They even invoke the dwellers of the graves for rain. These ignorant Muslims do not know the ruling on these acts or they may know it but choose to disregard it, so please, give us your Fatwaa regarding this issue.
Answer: All that you mentioned concerning offering sacrificial animals at the grave of the Walee is an act of Shirk (associating others with Allaah in His Divinity or worship). There is a detailed discussion about invoking them (other than Allaah) and seeking their help for rain or anything else among similar acts of major Shirk… read more here.