Abu Hatim al-Razi: From the freed slaves of the Shia, and is not strong in hadith
Ibn Hajar al-Asqalani: Truthful, but makes mistakes, and was a Shi'ite
al-Dhahabi: Sawilah did not abandon, a Shi'ite
Authors of Tahrir Taqrib al-Tahdhib: Weak, but can be considered