Al-Kāfi

Hadith 458
twelve-imams
1ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنِ ابْنِ الطَّيَّارِ قَالَ سَمِعْتُ أَبَا عَبْدِ الله (عَلَيْهِ السَّلام) يَقُولُ لَوْ لَمْ يَبْقَ فِي الارْضِ إِلا اثْنَانِ لَكَانَ أَحَدُهُمَا الْحُجَّةَ.
1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn Sinan from ibn al-Tayyar who has said the following. “I heard abu ‘Abdallah (a.s.) saying, ‘Would there remain no one on earth except two persons one of them would certainly be the person with Divine authority.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī