Is it permissible to describe a Christian or non-Muslim colleague as "brother" out of human fraternity, especially if the intention is to invite them to Islam and demonstrate its tolerance?
There is no harm in using the term "brotherhood" in reference to a disbeliever in this respect, but one should not overuse it without a valid reason.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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