Sahih Muslim Book - 1, Hadith - 394

و حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ حَدَّثَنِي الْوَلِيدُ بْنُ مُسْلِمٍ حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ عَنْ ابْنِ شِهَابٍ عَنْ نَافِعٍ مَوْلَى أَبِي قَتَادَةَ عَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ كَيْفَ أَنْتُمْ إِذَا نَزَلَ فِيكُمْ ابْنُ مَرْيَمَ فَأَمَّكُمْ مِنْكُمْ فَقُلْتُ لِابْنِ أَبِي ذِئْبٍ إِنَّ الْأَوْزَاعِيَّ حَدَّثَنَا عَنْ الزُّهْرِيِّ عَنْ نَافِعٍ عَنْ أَبِي هُرَيْرَةَ وَإِمَامُكُمْ مِنْكُمْ قَالَ ابْنُ أَبِي ذِئْبٍ تَدْرِي مَا أَمَّكُمْ مِنْكُمْ قُلْتُ تُخْبِرُنِي قَالَ فَأَمَّكُمْ بِكِتَابِ رَبِّكُمْ تَبَارَكَ وَتَعَالَى وَسُنَّةِ نَبِيِّكُمْ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ.

It was narrated from Abu Hurairah that the Messenger of Allah (s.a.w) said: "How will you be when the son of Mariam descends among you and you are led by one from among you?" I said to Ibn Abi Dhi'b: "Al-Awza'i narrated to us from Az-Zuhri, from Nafi', from Abu Hurairah: 'And your Imam is one of you."' Ibn Abi Dhi'b said: "Do you know what 'You are led by one from among you' - means?" I said: "Tell me." He said: "He will lead you according to the Book of your Lord, the Mighty and Sublime, and the Sunnah of your Prophet (s.a.w)."