Offering Salah behind a Shi`ite who belongs to Rafidah

Q 10: What is the ruling on offering Salah behind a Shi`ite who belongs to Rafidah (a Shi`ah group denying the caliphates of Abu Bakr Al-Siddiq and `Umar ibn Al-Khattab and making accusations against them and many other Companions of the Prophet)?

A: Salah which is offered behind a Mubtadi` (one who introduces innovations in religion) of a Mukaffirah (major sin whose perpetration lead to disbelief) practice is invalid. An example for the foregoing is one who seeks help from someone other than Allah, makes Du`a' (Supplication) to someone other than Allah, offers sacrifices to someone other than Allah, believes that the Qur'an is incomplete, defames the Mother of the Believers `Aishah (may Allah be pleased with her), reveres `Aly (may Allah be pleased with him) or any other person of Ahl-ul-Bayt (members of the Prophet's extended Muslim family) excessively, makes Du`a' to them instead of Allah, or slanders the Sahabah (Companions of the Prophet, may Allah be pleased with them all).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.