I heard 'Irbad bin Sariyah say: 'One day, the Messenger of Allah ﷺ stood up among us and delivered a deeply moving speech to us that melted our hearts and caused our eyes to overflow with tears. It was said to him: 'O Messenger of Allah, you have delivered a speech of farewell, so enjoin something upon us.' He said: 'I urge you to fear Allah, and to listen and obey, even if (your leader) is an Abyssinian slave. After I am gone, you will see great conflict. I urge you to adhere to my Sunnah and the path of the Rightly-Guided Caliphs, and cling stubbornly to it. And beware of newly-invented matters, for every innovation is a going astray.'"  

سَمِعْتُ الْعِرْبَاضَ بْنَ سَارِيَةَ يَقُولُ قَامَ فِينَا رَسُولُ اللَّهِ ﷺ ذَاتَ يَوْمٍ فَوَعَظَنَا مَوْعِظَةً بَلِيغَةً وَجِلَتْ مِنْهَا الْقُلُوبُ وَذَرَفَتْ مِنْهَا الْعُيُونُ فَقِيلَ يَا رَسُولَ اللَّهِ وَعَظْتَنَا مَوْعِظَةَ مُوَدِّعٍ فَاعْهَدْ إِلَيْنَا بِعَهْدٍ فَقَالَ عَلَيْكُمْ بِتَقْوَى اللَّهِ وَالسَّمْعِ وَالطَّاعَةِ وَإِنْ عَبْدًا حَبَشِيًّا وَسَتَرَوْنَ مِنْ بَعْدِي اخْتِلاَفًا شَدِيدًا فَعَلَيْكُمْ بِسُنَّتِي وَسُنَّةِ الْخُلَفَاءِ الرَّاشِدِينَ الْمَهْدِيِّينَ عَضُّوا عَلَيْهَا بِالنَّوَاجِذِ وَإِيَّاكُمْ وَالأُمُورَ الْمُحْدَثَاتِ فَإِنَّ كُلَّ بِدْعَةٍ ضَلاَلَةٌ  

He heard Al-'Irbad bin Sariyah say: "The Messenger of Allah ﷺ delivered a moving speech to us which made our eyes flow with tears and made our hearts melt. We said: 'O Messenger of Allah. This is a speech of farewell. What did you enjoin upon us?' He said: 'I am leaving you upon a (path of) brightness whose night is like its day. No one will deviate from it after I am gone but one who is doomed. Whoever among you lives will see great conflict. I urge you to adhere to what you know of my Sunnah and the path of the Rightly-Guided Caliphs, and cling stubbornly to it. And you must obey, even if (your leader is) an Abyssinian leader. For the true believer is like a camel with a ring in its nose; wherever it is driven, it complies."  

أَنَّهُ سَمِعَ الْعِرْبَاضَ بْنَ سَارِيَةَ يَقُولُ وَعَظَنَا رَسُولُ اللَّهِ ﷺ مَوْعِظَةً ذَرَفَتْ مِنْهَا الْعُيُونُ وَوَجِلَتْ مِنْهَا الْقُلُوبُ فَقُلْنَا يَا رَسُولَ اللَّهِ إِنَّ هَذِهِ لَمَوْعِظَةُ مُوَدِّعٍ فَمَاذَا تَعْهَدُ إِلَيْنَا؟ قَالَ: «قَدْ تَرَكْتُكُمْ عَلَى الْبَيْضَاءِ لَيْلُهَا كَنَهَارِهَا لاَ يَزِيغُ عَنْهَا بَعْدِي إِلاَّ هَالِكٌ۔ مَنْ يَعِشْ مِنْكُمْ فَسَيَرَى اخْتِلاَفًا كَثِيرًا۔ فَعَلَيْكُمْ بِمَا عَرَفْتُمْ مِنْ سُنَّتِي وَسُنَّةِ الْخُلَفَاءِ الرَّاشِدِينَ الْمَهْدِيِّينَ، عَضُّوا عَلَيْهَا بِالنَّوَاجِذِ وَعَلَيْكُمْ بِالطَّاعَةِ وَإِنْ عَبْدًا حَبَشِيًّا۔ فَإِنَّمَا الْمُؤْمِنُ كَالْجَمَلِ الأَنِفِ حَيْثُمَا قِيدَ انْقَادَ۔»  

"The Messenger of Allah ﷺ led us in Fajr (morning) prayer, then he turned to us and delivered an eloquent speech". And he mentioned something similar (as no.43)  

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ صَلاَةَ الصُّبْحِ ثُمَّ أَقْبَلَ عَلَيْنَا بِوَجْهِهِ فَوَعَظَنَا مَوْعِظَةً بَلِيغَةً فَذَكَرَ نَحْوَهُ