صحيح البخاري
Sahih Bukhari
كتاب الشهادات
The Book of Witnesses
باب لا يسأل أهل الشرك عن الشهادة وغيرها:
(29) Chapter. Al-Mushrikun (idolaters, polytheists, and pagans) should not be asked to give witness or the like (i.e., their witnesses are not acceptable).