Hadith 31-259

وَبِإِسْنادِهِ عَنْ عَلِيِ‏ عَلَيْهِ السَّلامُ قالَ: قالَ النَّبِي‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: إِنّي تارِكٌ فِيكُم الثَّقَلَيْنِ: كِتاب اللَّه وَعِتْرَتِي، وَلَنْ يَفتَرِقا حَتّى‏ يَرِدا عَلَي الحَوضَ.

According to the same documentation, on the authority of Ali (a.s.), the Prophet (S) said, “I leave two important things with you - God’s Book and my ‘Itra [81] . They will not separate from each other until they return to me at the Pool.”