Abu Ahmad ibn Adi al-Jurjani: He is acceptable, truthful
Abu Hatim al-Razi: Trustworthy, pious, firm
Abu Ya'la al-Khalili: He changed a few months before his death
Ahmad ibn Hanbal: Sound, he is sounder than Abd al-Rahman ibn Mahdi
Ahmad ibn Salih al-Jili: Trustworthy, sound
Ibn Hajar al-Asqalani: One of the great trustworthy and sound narrators. Al-Bukhari met him and narrated a few things from him. Sulayman ibn Harb criticized him harshly
Al-Dhahabi: This change was the change of the illness of death, and it did not harm him because he did not narrate anything erroneous
Zuhayr ibn Harb al-Nasa'i: We abandoned Uffan a few days before his death
Sulayman ibn Harb al-Azdi: We see that Uffan ibn Muslim used to memorize from Shu'bah. He was slow, had a poor memory, and was slow in understanding
Abd al-Baqi ibn Qani' al-Baghdadi: Trustworthy, reliable
Abd al-Rahman ibn Yusuf ibn Kharash: Trustworthy
Abdullah ibn al-Walid al-Mu'ayti: Uffan is sounder than Yahya al-Qattan
Ali ibn al-Madini: Whenever he had doubt about the authenticity of a hadith, he would abandon it
Muhammad ibn Sa'd, the scribe of Waqidi: Trustworthy, sound, authoritative
Authors of Tahrir Taqrib al-Tahdhib: Trustworthy, precise, sound, and great. His statement 'He sometimes erred' has no meaning to be mentioned
Yahya ibn Sa'id al-Qattan: If he agrees with me, I do not care who disagrees with me
Yahya ibn Ma'in: Trustworthy. We abandoned him in Safar 219, and he died shortly thereafter
Ya'qub ibn Shaybah al-Sadusi: Trustworthy, sound, precise