Basairud Darajaat: It is narrated from Ibne Maruf from Hammad bin Isa from Abul Jarud from Abu Basir from Abu Ja’far Imam Baqir (a.s.) that he said:
One day the Messenger of Allah (s.a.w.s.) said twice in the presence of his companions: “O Allah, show my brothers to me. Companions who were around him asked: Are we not your brothers, O Messenger of Allah (s.a.w.s.)? He replied: No, you all are my companions, and my brothers would be those people at the end of the time, who would believe in me without having seen me, the Almighty Allah has informed me about their and their fathers’ names before they will emerge from the loins of their fathers and the wombs of their mothers. For each of them, it would be more difficult to guard their religion than walking on thorns in the darkness of the night or holding embers; they would be lamps in darkness, the Almighty Allah would save them from every mischief and evil.”
[The Promised Mahdi, Allamah Muhammad Baqir al-Majlisi, Biharul Anwar, Volume 13 (Old Edition)/Volumes 51-52-53 (New Edition)]