Is it permissible to donate the reward of Salah (Prayer) to a persons deceased parents as in the case of giving Sadaqah (voluntary charity) on their behalf?
It is not permissible to perform Salah on behalf of a person's deceased parents or anyone else, or to donate the reward of Salah to them. As for the case of giving Sadaqah on their behalf, this is bound by legal text that only mentions Sadaqah, and Qiyas (analogy) is not permissible in this regard. Furthermore, nothing has ever been narrated from the Prophet (peace be upon him) or his Sahabah (Companions of the Prophet, may Allah be pleased with them) that indicates the permissibility of donating the reward of Salah to the deceased. (Part No. 9; Page No. 64) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.