Ka'b al-Ahbar

Kaʿb al-Aḥbār (Arabic: كعب الأحبار, full name Abū Isḥāq Kaʿb ibn Maniʿ al-Ḥimyarī (Arabic: ابو اسحاق كعب بن مانع الحميري) was a 7th-century Yemenite Jew from the Arab tribe of "Dhī Raʿīn" (Arabic: ذي رعين) who converted to Islam. He was considered to be the earliest authority on Israʼiliyyat and South Arabian lore. According to Islamic tradition, he accompanied Umar in his trip from Medina to Jerusalem, and afterwards, became a supporter of Uthman. He died in Hims around 652-56.