On the authority of Abu Najeeh al-’Irbaad ibn Saariyah (may Allah be pleased with him) who said:
                     
The Messenger of Allah (peace and blessings of Allah be upon him) gave 
us a sermon by which our hearts were filled with fear and tears came to 
our eyes. So we said, “O Messenger of Allah! It is as though this is a 
farewell sermon, so counsel us.” He (peace and blessings of Allah be 
upon him) said, “I counsel you to have taqwa (fear) of Allah, and to 
listen and obey [your leader], even if a slave were to become your 
ameer. Verily he among you who lives long will see great controversy, so
 you must keep to my Sunnah and to the Sunnah of the Khulafa 
ar-Rashideen (the rightly guided caliphs), those who guide to the right 
way. Cling to it stubbornly [literally: with your molar teeth]. Beware 
of newly invented matters [in the religion], for verily every bidah 
(innovation) is misguidance.”
It was related by Abu Dawud and at-Tirmidhi, who said that it was a good
 and sound hadeeth.
عَنْ أَبِي نَجِيحٍ الْعِرْبَاضِ بْنِ سَارِيَةَ رَضِيَ اللهُ عَنْهُ قَالَ: 
"وَعَظَنَا رَسُولُ اللَّهِ صلى 
الله عليه و سلم مَوْعِظَةً وَجِلَتْ مِنْهَا الْقُلُوبُ، وَذَرَفَتْ 
مِنْهَا الْعُيُونُ، فَقُلْنَا: يَا رَسُولَ اللَّهِ! كَأَنَّهَا 
مَوْعِظَةُ مُوَدِّعٍ فَأَوْصِنَا، قَالَ: أُوصِيكُمْ بِتَقْوَى اللَّهِ، 
وَالسَّمْعِ وَالطَّاعَةِ وَإِنْ تَأَمَّرَ عَلَيْكُمْ عَبْدٌ، فَإِنَّهُ 
مَنْ يَعِشْ مِنْكُمْ فَسَيَرَى اخْتِلَافًا كَثِيرًا، فَعَلَيْكُمْ 
بِسُنَّتِي وَسُنَّةِ الْخُلَفَاءِ الرَّاشِدِينَ الْمَهْدِيينَ، عَضُّوا 
عَلَيْهَا بِالنَّوَاجِذِ، وَإِيَّاكُمْ وَمُحْدَثَاتِ الْأُمُورِ؛ فَإِنَّ
 كُلَّ بِدْعَةٍ ضَلَالَةٌ". 
رَوَاهُ أَبُو دَاوُدَ [رقم:4607]، وَاَلتِّرْمِذِيُّ [رقم:266] وَقَالَ: حَدِيثٌ حَسَنٌ صَحِيحٌ.
رَوَاهُ أَبُو دَاوُدَ [رقم:4607]، وَاَلتِّرْمِذِيُّ [رقم:266] وَقَالَ: حَدِيثٌ حَسَنٌ صَحِيحٌ.
Reference: 40 Hadith Nawawi 28
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