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We also read in the book Kanzul Ummal, Imam Al Muttaqi Al Hindi,Page 122, Hadith #36389:
36389 - From 'Abbad ibn 'Abdullah, I heard Ali (may Allah be pleased with him) say: "I am the servant of Allah and the brother of His Messenger. I am the greatest truthful one (Al-Siddiq al-Akbar). No one will say this after me except a lying fabricator. Indeed, I prayed before the people by seven years." (Reported by Al-Shafi'i, Al-Nasa'i in Khasa'is, Ibn Abi Asim in As-Sunnah, 'Aqil, K, and Abu Na'im in Al-Ma'rifah.)
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