Ash-Shaykh Abdul-Muhsin al-Abbaad hafidaho-Allah was asked the following question:
“Is the origin of a Muslim that he is unknown [unless proven otherwise]? [And if this is the case], then based upon [this statement], some are advised with the following statement: “do not accompany so-and-so nor sit with him because you do not know his condition” [so what is the ruling on this statement]?”
“The origin is being unknown without a doubt, up until the uprightness or untrustworthines becomes known. The origin is that the people aren’t known up until someone comes and affirms his uprightness or his untrustworthines. As for it being said, “do not sit with so-and-so”, then a person should not busy himself [with this] except if he knows from a [particular] person that he will be harmful towards the one he is accompanying, and [that] he knows that he is a bad [companion], and that he has evil with him. Then, this is when it should be applicable [i.e. warning].
However in this present time, the good people have begun to be warned from. In this time, those who are people of goodness are being warned against while this is wrong.”
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Majid Jawed Al-Afghanee