I want to know about Ka'b el-Ahbar.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions. Books of biographies are full of stories about Ka'b al-Ahbar . For details one may refer to some history and biography books such as 'Al-Isaabah', by Ibn Hajar , 'Ththeeb Al-Kamaal' by Al-Mizzi , and others. However, we may mention brief biographical notes about him: he is Ka'b bin Mana' Al-Himyari Abu Is-haaq , from the tribe of Aal Thi Ra'een. He embraced Islam during the reign of Abu Bakr - some say during the reign of Umar (may Allah be pleased with them) and came to Al-Madinah, went to Syria, and then to Egypt where he died during the reign of Uthman (may Allah be pleased with him) in the year 32 Hegira (some mention other dates). Before Islam, he (may Allah have mercy upon his soul) was among the most outstanding Jewish monks. He read many books and narrated many stories and news. Some companions quoted some matters from him, such as Ibn Abbas , Ibn Amr , Ibn Az-Zubair , and Abu Hurairah . Allah knows best.