Abdullah ibn Sabaʾ al-Ḥimyarī (or ibn Sabāʾ, also sometimes called ibn al-Sawdāʾ, ibn Wahb, or ibn Ḥarb) was a dubious 7th-century figure in Islamic history who is often associated with a group of followers called the Sabaʾiyya (Arabic: سبئية‎).According to Sunni and Shia tradition, Abdullah bin Saba' was a Yemenite Jewish convert to Islam. Because of his exaggerated reverence for Ali, he is traditionally considered as the first of the ghulāt.

Abul-Hasan Muhammad ibn Al-Husayn Al-Musawi known in Arabic as al-Sharif al-Radi (Arabic: الشريف الرضي‎) and in Persian as Sharif Razi (Persian: شريف رضی‎) or Seyyed Razi (Persian: سید رضی‎) was a Shi'ite Muslim scholar and poet, who was born in 359 AH/970 CE in Baghdad and died in the year 406/1015 in his hometown. His grave is located in Kazmain, Iraq. He is popularly known by his laqab (nickname) Razi.