بعض أهل العلم أن عبد الله بن سبا كان يهوديا فأسلم ووالى عليا
عليه السلام وكان يقول وهو على يهوديته في يوشع بن نون وصي موسى بالغلو فقال
في إسلامه بعد وفاة رسول الله صلى الله عليه وآله في علي عليه السلام مثل ذلك.
وكان أول (٣ (من أشهر بالقول بفرض إمامة علي عليه السلام وأظهر البراءة من أعدائه
وكاشف مخالفيه وأكفرهم (٤ ،(فمن ههنا قال من خالف الشيعة: أصل التشيع والرفض
مأخوذ من اليهودية. (٥(
Source:
Sh'ite source for Bihar ul Anwar original Arabic:
In Bihar al-Anwar (25/287), al-Majlisi writes:
Some scholars have asserted that ibn Saba was a Jew who accepted Islam and started voicing his opinion of the wilayat (divine appointment) of Ali. While a Jew, he propounded the exaggerative notion that Yusha ibn Nun was divinely appointed to succeed Prophet Musa, he thus adopted a similar stance with regard to Ali in relation to the Holy Prophet. He was the first to subscribe to the belief of Imamate, and he openly vitriolated his enemies (i.e. the first three Caliphs) and branded them as infidels. The origin of Shi'ism is thus based on Judaism.
English translation source: http://www.themadkhalis.com/md/articles/elmbe-sayyid-qutb-and-the-jewish-led-revolution-against-the-third-khalifah-uthman-bin-affaan.cfm