وَمِنَ الْمُهِمِّ أَيْضًا مَعْرِفَةُ بُلْدَانِهِمْ وَأَوْطَانِهِمْ
It is also important to know the transmitters’ towns and places of origin.
Geographic nisbahs can distinguish people with otherwise similar names. Yet a nisbah is not always a birthplace: a person may be associated with a place through residence, study, migration, or recognized affiliation.
A narrator can therefore have more than one valid geographic designation. Treat birthplace, residence, and nisbah as related but separately verifiable facts rather than making an entire life history out of a single label.