Ubai bin Ka'b

Ayyub al-Sakhtiyani Abu Bakr ibn Kaysan al-Basri was one of the greatest Tabi'i hadith scholars and one of the most rigorous transmitters of the Sunnah in the second generation of Islam. He was born around 66 AH and spent his scholarly career in Basra, narrating from Ibn Sirin, Ata ibn Abi Rabah, Amr ibn Dinar, al-Hasan al-Basri, Nafi mawla Ibn Umar, and many other leading scholars of his era. He was profoundly committed to the Sunnah and was among the firmest opponents of innovation in religious matters. Imam Ahmad ibn Hanbal praised him in the highest terms as a scholar and a man of principle. He was known to weep when he heard the adhan out of awe of Allah. His narrations are found extensively throughout Sahih al-Bukhari, Sahih Muslim, and all the major Sunan collections, and the scholars of hadith criticism unanimously rated him as thiqa thiqa (doubly trustworthy). He passed away in 131 AH. The entry appears in the collections under the rendering Aiyub.