Al-Kāfi

Hadith 474
twelve-imams
12ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ عَبْدِ الله بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ أَبَانٍ عَنْ أَبِي بَصِيرٍ قَالَ قَالَ لِي أَبُو جَعْفَرٍ (عَلَيْهِ السَّلام) هَلْ عَرَفْتَ إِمَامَكَ قَالَ قُلْتُ إِي وَالله قَبْلَ أَنْ أَخْرُجَ مِنَ الْكُوفَةِ فَقَالَ حَسْبُكَ إِذاً.
12. Muhammad ibn Yahya has narrated from ‘Abdallah ibn Muhammad from Ali ibn al-Hakam from aban from abu Basir saying that Imam abu Ja’far‘far (a.s.) said to him the following. “Have you found out who your Imam is?” I said, “Yes, I swear by Allah, I did so before I left Kufa.” The Imam (a.s.) said, “Then it is sufficient for you.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī