Little is known about Ka'b, but according to tradition, he came to Medina during the reign of Umar. He then accompanied Umar in his voyage to
Jerusalem. It is reported that when Umar marched into Jerusalem with an army, he asked Ka‘b: "Where do you advise me to build a place of worship?" Ka‘b indicated the
Temple Rock, now a gigantic heap of ruins from the
temple of Jupiter. The Jews, Ka‘b explained, had briefly won back their old capital a quarter of a century before (when
Persians overran Syria), but they had not had time to clear the site of the Temple, for the Byzantines (
Rūm) had recaptured the city. It was then that Umar ordered the rubbish on the Temple Rock to be removed by the
Nabataeans, and after three showers of heavy rain had cleansed the Rock, he instituted prayers there. Umar is said to have fenced it and, some years later, the
Umayyad caliph Abd al-Malik built the
Dome of the Rock over the site as an integral part of the
Aqsa compound. Until this day, the place is known as
Qubbat al-Ṣakhra (the Dome of the Rock). According to tradition, Ka‘b believed that "Every event that has taken place or will take place on any foot of the earth, is written in the Tourat (
Torah), which God revealed to his Prophet
Moses". He is said to have predicted the death of Umar using the Torah. According to one narration, Ka‘b told Umar "you ought to write your will because you will die in three days." Umar responded "I do not feel any pain or sickness".
Abu Lulu assassinated Umar two days later. After Umar's death, Ka‘b vigorously supported
Uthman. Subsequently, governor
Mu'awiya asked Ka'b to become his counsel in
Damascus, but he most likely chose to withdraw to
Hims, where he died in AD 652-56, according to various accounts. His burial place is disputed. According to Shia sources Ka‘ab was a Jewish rabbi, who moved from
Yemen to
Bilad al-Sham (Syria). He was of the clan of Dhu Ra'in or Dhu al-Kila. Ka‘b came to
Medina during the time of
Umar where he converted to Islam. He lived there until
Uthman's era. ==Disputed views: Rashidun period==