[Machine] The Prophet Muhammad ﷺ addressed the people during the Farewell Pilgrimage and said, "Satan has despaired of being worshipped in your land. However, he is content to be obeyed in matters other than that which you belittle from your actions. So beware, O people, I have left among you that which, if you hold fast to it, you will never go astray—the Book of Allah and the Sunnah of His Messenger ﷺ. Indeed, every Muslim is the brother of another Muslim. The Muslims are brothers to one another and it is not permissible for a person to take from his brother's wealth except what is given willingly. Do not wrong one another, nor turn back as disbelievers after me. Some of you strike the necks of others." Al-Bukhari has cited this hadith through the narration of 'Ikrimah, and Muslim has cited it through the narration of Abu Uwais and through other narrators. This hadith, regarding the Prophet's sermon, is agreed upon to have been included in the authentic collections.

The mention of holding fast to the Sunnah in this sermon is strange and requires emphasis. I have found evidence for it in a hadith narrated by Abu Hurairah. Al-Bukhari has cited it through 'Umar and 'Ali, and Muslim has cited it through Abu Hurairah.  

أَنَّ رَسُولَ اللَّهِ ﷺ خَطَبَ النَّاسَ فِي حَجَّةِ الْوَدَاعِ فَقَالَ «قَدْ يَئِسَ الشَّيْطَانُ بِأَنْ يُعْبَدَ بِأَرْضِكُمْ وَلَكِنَّهُ رَضِيَ أَنْ يُطَاعَ فِيمَا سِوَى ذَلِكَ مِمَّا تُحَاقِرُونَ مِنْ أَعْمَالِكُمْ فَاحْذَرُوا يَا أَيُّهَا النَّاسُ إِنِّي قَدْ تَرَكْتُ فِيكُمْ مَا إِنِ اعْتَصَمْتُمْ بِهِ فَلَنْ تَضِلُّوا أَبَدًا كِتَابَ اللَّهِ وَسُنَّةَ نَبِيِّهِ ﷺ إِنَّ كُلَّ مُسْلِمٍ أَخٌ مُسْلِمٌ الْمُسْلِمُونَ إِخْوَةٌ وَلَا يَحِلُّ لِامْرِئٍ مِنْ مَالِ أَخِيهِ إِلَّا مَا أَعْطَاهُ عَنْ طِيبِ نَفْسٍ وَلَا تَظْلِمُوا وَلَا تَرْجِعُوا مِنْ بَعْدِي كُفَّارًا يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ» وَقَدِ احْتَجَّ الْبُخَارِيُّ بِأَحَادِيثِ عِكْرِمَةَ وَاحْتَجَّ مُسْلِمٌ بِأَبِي أُوَيْسٍ وَسَائِرُ رُوَاتِهِ مُتَّفَقٌ عَلَيْهِمْ وَهَذَا الْحَدِيثُ لِخُطْبَةِ النَّبِيِّ ﷺ مُتَّفَقٌ عَلَى إِخْرَاجِهِ فِي الصَّحِيحِ «يَا أَيُّهَا النَّاسُ إِنِّي قَدْ تَرَكْتُ فِيكُمْ مَا لَنْ تَضِلُّوا بَعْدَهُ إِنِ اعْتَصَمْتُمْ بِهِ كِتَابَ اللَّهِ وَأَنْتُمْ مَسْئُولُونَ عَنِّي فَمَا أَنْتُمْ قَائِلُونَ؟» وَذِكْرُ الِاعْتِصَامِ بِالسُّنَّةِ فِي هَذِهِ الْخُطْبَةِ غَرِيبٌ وَيَحْتَاجُ إِلَيْهَا وَقَدْ وَجَدْتُ لَهُ شَاهِدًا مِنْ حَدِيثِ أَبِي هُرَيْرَةَاحتج البخاري بعكرمة واحتج مسلم بأبي أويس عبد الله وله أصل في الصحيح