Ubayy ibn Ka'b
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Ubayy ibn Ka'b (Arabic: أُبَيّ ٱبْن كَعْب, ʾUbayy ibn Kaʿb) (died 649), also known as Abu Mundhir, was a companion of the Islamic prophet Muhammad and a person of high esteem in the early Muslim community.
Ubayy was born in Medina (then known as Yathrib), into the tribe of the Banu Khazraj. He was one of the first to accept Islam and pledge allegiance to Muhammad at Aqabah before the migration to Medina, becoming one of the Ansar. He participated in the battle of Badr and other following engagements.
He acted as a scribe for Muhammad, writing letters for him. Ubayy was one of the few who put the Qur'anic Surahs into writing and had a Mushaf of his own. Following Muhammad's death, he was one of the twenty-five Hafiz, people who knew the Qur'an completely by heart.
He was part of the consultative group (mushawarah) to which the caliph Abu Bakr referred many problems. It included Umar, Uthman, Ali, Abd-al-Rahman ibn Awf, Muadh ibn Jabal, Ubayy ibn Ka'b, and Zayd ibn Thabit.
- "Sahih Muslim, hadith 810". Retrieved 2020-02-27.