Giving Sadaqah on behalf of a deceased person and his knowledge about it
A: It is denoted by Shari`ah (Islamic law) texts that a dead person benefits from the Sadaqah and Du`a' (supplication) offered by living persons on their behalf. A sacrificial animal is one of the kinds of Sadaqah. (Part No. 9; Page No. 33) If a person is sincere in his Sadaqah or Du`a' for the dead person, the dead person will benefit from them. Moreover, a person who supplicates and pays Sadaqah will also receive a reward out of Allah's Bounty and Mercy. It is sufficient for a person that Allah knows that he is sincere in doing righteous deeds. Therefore, the dead person and the living people who pay Sadaqah or supplicate to Allah will receive a reward. But there is no authentic proof that the dead person knows the person who grants him this reward. This is one of the unseen things that can not be known except through Revelation from Allah to His Messenger Muhammad (peace be upon him).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.