Sulaym Ibn Qays (Arabic: سليم بن قيس) was one of the purported Companions of Ali but he "is widely considered an anti-Umayyad polemical invention" by Sunni scholarship. He has a well-known book known as The book of Sulaym ibn Qays. As Ibn al-Nadim says and later investigation shows his book is "the oldest surviving Shi`ite book" which is written in the first Islamic century. [1][2]
After Ali died, during Muawiyah era, Sulaym remained in Kufa. He gathered some information such as Muawiyah sermon in the mosque of Kufa. [2][3]
When Hajjaj ibn Yusuf became the governor of Kufa, he fled to Persia with his writings in 694. He stayed in Nobandegan. There he found a fifteen years old boy, Aban ibn abi-Ayyash. He became rather fond of him abd started to educate him and Aban eventually also became a Shi'a. Eventually, Sulaym entrusted all of his writings to Aban, after Aban had made a solemn oath not to talk of any of the writings during Sulaym’s lifetime and that after his death he would give the book only to trustworthy Shi'a of Ali.[2]