Both medieval Christian and Islamic law excluded the other’s adherents as witnesses

Evidence

Christian witnesses were always to be preferred to Jews and Muslims. Similarly, in Islam, Christians might not witness before the gad7, i.e. he could not witness in a case involving a Muslim. — Norman Daniel, Islam and the West, 2403

Categorization

• XREF: Symmetry of exclusion in Christian and Muslim legal practice complicates the one-directional ‘West constructs Islam’ narrative in the Anidjar/Aziz cluster — both sides policed legal boundaries.