Mishkat al-Masabih
Mishkat al-Masabih 189
Arabic hadith text
وَعَن إِبْرَاهِيم بن ميسرَة قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ وَقَّرَ صَاحِبَ بِدْعَةٍ فَقَدْ أَعَانَ عَلَى هَدْمِ الْإِسْلَامِ» . رَوَاهُ الْبَيْهَقِيُّ فِي شُعَبِ الايمان مُرْسلا
Translation
Ibrāhīm ibn Maysara reported that the Messenger of God said: ‘Whoever honors a person of innovation has aided the destruction of Islam.’ Al-Bayhaqī transmitted it in Shuʿab al-Īmān in mursal form.