Call to Prayers (Adhaan)
10/56. Chapter:
Offering prayers behind a man who is a victim of Al-Fitan (trials and affections) or a heretic.
وَقَالَ الْحَسَنُ صَلِّ وَعَلَيْهِ بِدْعَتُهُ.Al-Hasan said, "You can offer prayers behind that Imam and the sin of heresy will be against him."
Sahih Bukhari
حَدَّثَنَا مُحَمَّدُ بْنُ أَبَانَ، حَدَّثَنَا غُنْدَرٌ، عَنْ شُعْبَةَ، عَنْ أَبِي التَّيَّاحِ، أَنَّهُ سَمِعَ أَنَسَ بْنَ مَالِكٍ، قَالَ النَّبِيُّ صلى الله عليه وسلم لأَبِي ذَرٍّ " اسْمَعْ وَأَطِعْ، وَلَوْ لِحَبَشِيٍّ كَأَنَّ رَأْسَهُ زَبِيبَةٌ ".
Narrated Anas bin Malik: The Prophet (ﷺ) said to Abu-Dhar, "Listen and obey (your chief) even if he is an Ethiopian with a head like a raisin."
Reference : Sahih al-Bukhari 696In-book reference : Book 10, Hadith 91USC-MSA web (English) reference : Vol. 1, Book 11, Hadith 664