عَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ: ((أَتَانِي جِبْرِيلُ عَلَيْهِ السَّلَامُ فَقَالَ: يَا مُحَمَّدُ! إِنَّ أُمَّتَكَ مُخْتَلِفَةٌ بَعْدَكَ، قَالَ: فَقُلْتُ لَهُ: فَأَيْنَ الْمَخْرَجُ يَا جِبْرِيلُ! قَالَ: فَقَالَ: كِتَابُ اللَّهِ تَعَالَى، بِهِ يَقْصِمُ اللَّهُ كُلَّ جَبَّارٍ، مَنْ اعْتَصَمَ بِهِ نَجَا، وَمَنْ تَرَكَهُ هَلَكَ مَرَّتَيْنِ، قَوْلُهُ فَصْلٌ وَلَيْسَ بِالْهَزْلِ، لَا تَخْتَلِقُهُ الْأَلْسُنُ وَلَا تَفْنَى عَجَائِبُهُ، فِيهِ نَبَأُ مَا كَانَ قَبْلَكُمْ وَفَصْلُ مَا بَيْنَكُمْ وَخَبَرُ مَا هُوَ كَائِنٌ بَعْدَكَ))
It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Jibreel (peace be upon him) came to me and said: O Muhammad! Your ummah will differ after you." I said: "O Jibreel! What will be the way out of this?" He said: "The Book of Allah; Allah will destroy every rebellious one through it. Whoever holds fast to it will be saved, and whoever abandons it will be destroyed." He said this twice. His word is true and decisive, and it is not a joke. Tongues cannot fabricate it, its wonders will never cease, in it is the decision of what is among you, and in it is news of what will happen after you.