Abu Al-Arab Al-Qayrawani: Whoever insults the Companions is not trustworthy nor reliable
Abu Hatim bin Hibban Al-Busti: He was a worshipper
Ahmad bin Shuayb An-Nasa'i: He authenticated him
Mu'awiyah bin Salih Ad-Dimashqi: He was acceptable
Yahya bin Ma'in: Among those who insult Ali