What Is the Ruling on Transacting and Interacting with the Bahā’is?

The Bahāʼī Faith is a religious sect that originated in the Bābī religion and was founded in the 13th century by Mirza Hussain Ali Nouri, better known as Bahāullāh.

What is the ruling on transacting with those whose faith is Bahāʼīsm?  If a Muslim transacts with a Baha’i, can we transact with that Muslim on the same thing he transacted with the Baha’i on? For example, a Baha’i owns a store and a Shi’ah rents it from him and opens a dry cleaner’s there. Is it permissible for us to take our clothes there? 3- If a person says he isn’t Baha’i, is that enough for us to believe him or do we have to investigate?

The office of the Grand Ayatullah Khamenei (may Allah prolong his life):

A1) All followers of the misguided and deviated Baha’i faith are najis and all transacting and interaction with them must be refrained from.

A2) It is not problematic per se.

A3) It suffices and there is no need to investigate.

The office of the Grand Ayatollah Makarem Shirazi (may Allah prolong his life):

1 and 3- Transacting with advocates of the misguided Bahāʼī sect is impermissible, and if someone is known to be a Baha’i, that is enough to prove his Bahāʼīsm.

2- In the case of the question, it is permissible.

Ayatollah Mahdi Hadavi Tehrani (may Allah prolong his life):

1- Although transacting with the disbelievers, including the Bahāʼī, is permissible per se, but since this misguided and deviating sect is a supporter and companion of Zionism in its theoretical opposition to Islam, any form of aid to them is haram and must be refrained from.

2- In the case mentioned, it is permissible to give the clothes to the dry cleaner’s, although renting that place from the Baha’i by the Muslim is haram in the first place because it falls under the category of collaborating with the Bahāʼī.

3- If he says he isn’t, that will suffice, unless it is proven otherwise, and there is no need for investigation.

source:islamquest