Majma al-Zawaid — Hadith 13904

Sayyiduna al-Faltan bin Asim (may Allah be pleased with him) narrates: We were sitting with the Prophet (peace and blessings be upon him). Meanwhile he raised his gaze and looked at a man in the mosque, and said: "O so-and-so!" That man said: "O Messenger of Allah! Here I am." He did not say anything else; he only said: "O Messenger of Allah!" The Prophet (peace and blessings be upon him) said: "Do you bear witness that I am the Messenger of Allah?" He replied: "No!" The Prophet (peace and blessings be upon him) asked: "Have you read the Torah?" He replied: "Yes! And I have read the Injil too." The Prophet (peace and blessings be upon him) asked: "And the Qur'an?" He said: "By the One in whose hand is my life! If I wished, I could read that too." The narrator says: The Prophet (peace and blessings be upon him) adjured him and asked: "Have you found mention of me in the Torah and the Injil?" He said: "I have found someone like you and like your appearance, but we hoped that that prophet would be from among our people. When you appeared, we were bewildered as to how you could be that prophet. When we investigated the matter, you are not that person." The Prophet (peace and blessings be upon him) said: "How is that?" He said: "Because with that prophet there were to be seventy thousand of his Ummah who would enter Paradise without any reckoning or punishment, and with you there are only a few people." The Prophet (peace and blessings be upon him) said: "By the One in whose hand is my life, I am that 'Prophet', and they will be the people of my Ummah, and they will be more in number than seventy thousand and another seventy thousand (who will enter Paradise without any reckoning)."
Al-Tabarani recorded it, and its narrators are thiqat (trustworthy), through one of the two routes.