Abu al-'Arab al-Qayrawani: He was extremely biased against Ali, and he said: 'Whoever does not love the Companions is not trustworthy or honorable.'
Abu Hatim al-Razi: A sound narrator of hadith
Abu Hafs Umar ibn Shahin: Trustworthy
Ahmad ibn Hanbal: A trustworthy sheikh
Ahmad ibn Shu'ayb al-Nasa'i: Trustworthy
Ahmad ibn Salih al-Jili: Trustworthy, but he was biased against Ali
Ibn Hajar al-'Asqalani: Truthful, but he was accused of being a Kharijite
Muhammad ibn Sa'd, the scribe of al-Waqidi: Trustworthy, God willing
Authors of Tahrir Taqrib al-Tahdhib: Trustworthy
Yahya ibn Ma'in: Trustworthy