In traditional Shia sources, Abd Allah ibn Saba' is viewed as an extremist (
Ghali) that was cursed and killed by
Ali ibn Abi Talib (1st Shia Imam), and cursed by
Ali ibn Husayn (4th Shia Imam),
Muhammad al-Baqir (5th Shia Imam) and
Ja'far al-Sadiq (6th Shia Imam). Nevertheless, Ibn Sabaʾ became the subject of a tradition used by different Shia factions to both attack and defend extreme Shia groups. Shia scholars such as Abu Muhammad al-Hasan bin Musa al-Nawbakhti, Abu Amr bin Abdul Aziz al-Kash-shi, Al-Hasan bin Ali al-Hilly, al-Astra Abadi,
Al-Sadooq, and
Al-Nawbakhty talked about the stories and narrations of Ibn Saba. Al-Maamiqaaniy has asserted the existence of Abd Allah ibn Saba'. It is narrated different traditions from Shia Imams in the book about the belief of Abd Allah ibn Saba' (i.e. divinity of Ali and prophethood of himself), and also cursing of him by different Shia Imams. One such example includes: After narrating the traditions of Shia Imams which say that Abd Allah ibn Saba' was a cursed person who believed that Ali is God, about him, says: Shia scholars have said that "Some knowledgeable people" in the saying of Kashshi refers to those Sunni scholars that wrongly attributed the founding of Shia beliefs to Abd Allah ibn Saba', based on the invented tales of Sayf ibn Umar about whom Sunni eminent scholars like
al-Dhahabi, Haakim, Ibn Habban, etc. have said that was a hadith fabricator, liar and also a (atheist). Al-Maamqaani from his work Tanqih al-Maqaal Fi Ilm al-Rijaal (2/183-184): From Sa'd ibn Abd Allah al-Ash'ari al-Qummi who was speaking of the Sab'iyyah (in al-Maqaalaat wal-Firaq p. 20): Regarding to this saying of Sa'd bin Abd Allah al-Ash'ari al-Qummi, Shia scholars say that he did not mention any chain of authorities nor did he mention from whom (or which book) he got the story and what his source was. Moreover, al-Ash’ari al-Qummi has narrated many traditions from Sunni authorities. al-Najjashi (d. 450) in his "al-Rijal" said that al-Ash’ari al-Qummi traveled to many places and was well known for his relation with Sunni historians and heard many stories from them. So, he surely wrote this report from what he heard from Sunnis, which was indeed based on the stories of Sayf ibn Umar. Ni'matullah al-Jazaa'iree, another of Shi'ite famous scholars from his book al-Anwaar al-Nu'maaniyyah (2/234): The first part of the saying of Ni'matullah al-Jazaa'iree is the Shia belief about Abd Allah ibn Saba' which is based on the authentic traditions. But the second part of his saying ( i.e., And it is said that he was a Jew who accepted Islam ... ) is about the story which was made by Sayf ibn Umar. Usually, in Islamic books, using from the term 'قيل' ( Ghila, i.e., It is said ... ) before mentioning a matter by the author, implies the belief of the author about the weakness of the saying which is mentioned after it. So, using the term 'Ghila' by Ni'matullah al-Jazaa'iree shows that he believed that the saying is weak. Famous Shia scholar Nau Bakhti writes, Muhammad Ali al-Mual'lim, a present-day Shi'ite, also affirmed the existence of Abd Allah ibn Saba' in his book
Abdullah bin Saba: The Unknown Reality. This book was a refutation of those who denied the existence of Abd Allah ibn Saba' giving the excuse of "false narrations". Modern Shia historians often cite a number of Sunni scholars who considered Sayf ibn Umar as unreliable on matters of prophetic hadith. For example, al-Dhahabi (d. 748 AH) has quoted from the book of Sayf in his History, but wrote in "al-Mughni fi al-Dhu'afa'" that: "Sayf has two books which have been unanimously abandoned by the scholars." They point out to a number of prominent Sunni scholars concur regarding his narration of hadith. including al-Hakim, Abu Dawud, al-Suyuti and al-Nisa'i. However, some modern historians have pointed out that this view of Sayf should be limited to his hadith scholarship, and thus it does not detract from his general reliability as a transmitter of historical information. But this is not acceptable. Because when he used to make many fake traditions, so that logically he used to make fake tales and then narrate them as historical stories. ==Other sources==