In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Question: Our Shaikh (may Allaah preserve you); the questioner says: What is the ruling on the common people of the Rawaafid (shia) and how do we deal with them?
Answer: The questioner differentiates between the common people and other than them. This is a good approach. The common people who neither speak ill of the wives of the Messenger of Allaah [sallal-laahu-alayhi-wasallam] nor do they make Takfeer of the Sahaabah [radiyallaahu-anhum], nor do they believe that the Qur’aan is distorted; but they have some Rafd [i.e. beliefs of the raafidah] and some hatred for the Sahaabah without making Takfeer of them and what is similar to [these deeds]; then these ones are misguided innovators and we do not declare them disbelievers.
And whoever joins their heretics in pronouncing Takfeer against Muhammad’s [sallal-laahu-alayhi-wasallam] Sahaabah; speaking ill of the wives of the Messenger of Allaah [sallal-laahu-alayhi-wasallam] and the filthy belief that the Qur’aan has been distorted, and that there is an addition and deficiency in it, then this [person] is a Kaafir [disbeliever]- similar to the disbelievers of the Yahood and Nasaaraa. There is no differentiation between their common people and their scholars [in this affair].
Question: How do we deal with them? Answer: If dealing with them is with regards to a worldly affair—business transactions and what is similar to that— it is permissible to trade with a Yahoodi, a Nasraani and a Raafidee. However, as for co-operating with them in the affairs of religion, then never. [Allaah (The Most High)] said: [وَلَا تَعَاوَنُواْ عَلَى ٱلۡإِثۡمِ وَٱلۡعُدۡوَٲنِۚ -Do not help one another in sin and transgression][5:2] Rather their scholars and callers are boycotted and they are warned against.
[Source: الذريعة إلى بيان مقاصد كتاب الشريعة] [ Vol 3. Page: 595]