Abu al-Qasim al-Hizli: He did not see anyone like him in his time
Abu Hatim al-Razi: Saduq (truthful)
Abu Hatim ibn Habban al-Busti: He mentioned him among the trustworthy
Abu Dawud al-Sijistani: He is the most knowledgeable person I have seen in the letters, the differences in the Qur'an, its causes, its schools of thought, and the schools of grammar
Ahmad ibn Hanbal: Saduq (truthful), there was nothing wrong with him
Ibn Hajar al-Asqalani: Saduq (truthful)
Al-Dhahabi: Thiqah (trustworthy)
Ali ibn Ja'far al-Saeedi: The most well-read of his time and he did not make grammatical errors in his speech
Muhammad ibn Sa'd Kathib al-Waqidi: He is not considered very reliable by them, they mention that he narrated from men whom he met when he was young