Sahih al-Bukhari 7277
Sahih al-Bukhari · Book 96: Holding Fast to the Qur'an and Sunnah · Following the Sunna of the Prophet (saws)
Narrated `Abdullah:
حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ ، حَدَّثَنَا شُعْبَةُ ، أَخْبَرَنَا عَمْرُو بْنُ مُرَّةَ ، سَمِعْتُ مُرَّةَ الْهَمْدَانِيَّ ، يَقُولُ قَالَ عَبْدُ اللَّهِ إِنَّ أَحْسَنَ الْحَدِيثِ كِتَابُ اللَّهِ، وَأَحْسَنَ الْهَدْىِ هَدْىُ مُحَمَّدٍ صلى الله عليه وسلم، وَشَرَّ الأُمُورِ مُحْدَثَاتُهَا، وَإِنَّ مَا تُوعَدُونَ لآتٍ، وَمَا أَنْتُمْ بِمُعْجِزِينَ.
The best talk (speech) is Allah's Book 'Qur'an), and the best way is the way of Muhammad, and the worst matters are the heresies (those new things which are introduced into the religion); and whatever you have been promised will surely come to pass, and you cannot escape (it).