Al-Kāfi - Volume 1 > Tacit and Explicit Testimony as proof of al-Hassan ibn Ali’s (a.s.) (a.s.) Divine Authority over the people after Amir al-Mu’minin Ali (a.s.)
Hadith #2

2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عَبْدِ الصَّمَدِ بْنِ بَشِيرٍ عَنْ أَبِي الْجَارُودِ عَنْ ابي جعفر (عَلَيْهِ السَّلام) قَالَ إِنَّ أَمِيرَ الْمُؤْمِنِينَ (صَلَّى اللهُ عَلَيْهِ وَآلِه) لَمَّا حَضَرَهُ الَّذِي حَضَرَهُ قَالَ لابْنِهِ الْحَسَنِ ادْنُ مِنِّي حَتَّى أُسِرَّ إِلَيْكَ مَا أَسَرَّ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) إِلَيَّ وَأَئْتَمِنَكَ عَلَى مَا ائْتَمَنَنِي عَلَيْهِ فَفَعَلَ.

2. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from’’Abd al-Samad ibn Bashir from abu al-Jarud from abu Ja‘far (a.s.) who has said the following. “When Amir al-Mu’minin Ali (a.s.) was about to leave this world, he called his son, al-Hassan (a.s.) saying, “ Come very close to me so I can speak to you secretly just as the Messenger of Allah did to me and entrust you with all that he entrusted me with and he did so.”