Al-Kāfi - Volume 1 > Tacit and Explicit Testimony as proof of Ali ibn al-Husayn’s (a.s.) Divine Authority over the people after al-Husayn (a.s.)
Hadith #4

4ـ وَفِي نُسْخَةِ الصَّفْوَانِيِّ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَنَانِ بْنِ سَدِيرٍ عَنْ فُلَيْحِ بْنِ أَبِي بَكْرٍ الشَّيْبَانِيِّ قَالَ وَالله إِنِّي لَجَالِسٌ عِنْدَ عَلِيِّ بْنِ الْحُسَيْنِ وَعِنْدَهُ وُلْدُهُ إِذْ جَاءَهُ جَابِرُ بْنُ عَبْدِ الله الانْصَارِيُّ فَسَلَّمَ عَلَيْهِ ثُمَّ أَخَذَ بِيَدِ ابي جعفر (عَلَيْهِ السَّلام) فَخَلا بِهِ فَقَالَ إِنَّ رَسُولَ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) أَخْبَرَنِي أَنِّي سَأُدْرِكُ رَجُلاً مِنْ أَهْلِ بَيْتِهِ يُقَالُ لَهُ مُحَمَّدُ بْنُ عَلِيٍّ يُكَنَّى أَبَا جَعْفَرٍ فَإِذَا أَدْرَكْتَهُ فَأَقْرِئْهُ مِنِّي السَّلامَ قَالَ وَمَضَى جَابِرٌ وَرَجَعَ أَبُو جَعْفَرٍ (عَلَيْهِ السَّلام) فَجَلَسَ مَعَ أَبِيهِ عَلِيِّ بن الحسين (عَلَيْهما السَّلام) وَإِخْوَتِهِ فَلَمَّا صَلَّى الْمَغْرِبَ قَالَ عَلِيُّ بْنُ الْحُسَيْنِ لابي جعفر (عَلَيْهِ السَّلام) أَيَّ شَيْ‏ءٍ قَالَ لَكَ جَابِرُ بْنُ عَبْدِ الله الانْصَارِيُّ فَقَالَ قَالَ إِنَّ رَسُولَ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) قَالَ إِنَّكَ سَتُدْرِكُ رَجُلاً مِنْ أَهْلِ بَيْتِيَ اسْمُهُ مُحَمَّدُ بْنُ عَلِيٍّ يُكَنَّى أَبَا جَعْفَرٍ فَأَقْرِئْهُ مِنِّي السَّلامَ فَقَالَ لَهُ أَبُوهُ هَنِيئاً لَكَ يَا بُنَيَّ مَا خَصَّكَ الله بِهِ مِنْ رَسُولِهِ مِنْ بَيْنِ أَهْلِ بَيْتِكَ لا تُطْلِعْ إِخْوَتَكَ عَلَى هَذَا فَيَكِيدُوا لَكَ كَيْداً كَمَا كَادُوا إِخْوَةُ يُوسُفَ لِيُوسُفَ (عَلَيْهِ السَّلام )

4. Ali ibn Ibrahim has narrated from his father from Hanan ibn Sadir from Falih ibn abu Bakr al-Shaybani who has said the following. “ I swear by Allah, I was sitting in the presence of Ali ibn al-Husayn (a.s.) whose sons also were there when Jabur ibn ‘Abdallah al-Ansari came. He offered his greeting then he held the hand of abu Ja‘far (a.s.) and took him aside for privacy and said, “The Messenger of Allah informed me that I would find my self with a man from Ahl al-Bayt (family the Holy Prophet (s.a.) who would be called ‘Muhammad ibn Ali’ also called abu Ja‘far (father of Ja‘far). When abu Ja‘far returned to the meeting he sat near his father, Ali ibn al-Husayn (a.s.) and his brothers. When the Imam performed the Maghrib prayer (the prayer at sun set, Ali ibn al-Husayn asked abu Ja‘far (a.s.), “What did Jabut ibn ‘Abdallah al-Ansari say to you?” He (abu Ja‘far ) said, “Jabur said that the Messenger of Allah said to him the following, “You will soon find yourself with a man from my Ahl al-Bayt (my family) whose name is Muhammad ibn Ali also called abu Ja‘far (father of Ja‘far). Convey that offer him greetings.” His father (abu Ja‘far’s father) then said, “Success for you, my son, for what Allah has granted to you exclusively from His messenger from among the members of your family. Do not tell it to your brothers lest they may plan against you a plot as his brothers plotted against Joseph.”