Abu Ahmad al-Hakim: He is not strong (reliable) according to them
Abu Ahmad bin Adi al-Jurjani: He narrated unpreserved hadiths from Saeed, and from Abi Ma'bad as well
Abu Bakr bin Ghalib al-Khwarazmi: Abandoned in Hadith
Abu Hatim al-Razi: I wrote about him and discarded his hadith
Ahmad bin Hanbal: I wrote about him and abandoned his hadith, and he said: I went to him, me and Abu Khaithama, and he brought out to us a book from Saeed bin Bashir, and it contained hadiths of Saeed bin Abi 'Urooba, so we left him
Ahmad bin Shu'aib al-Nasa'i: He is not trustworthy
Ibrahim bin Ya'qub al-Jawzajani: We wrote from him in Baghdad, his hadith was dropped
Ibn Abi Hatim al-Razi: I wrote about him and abandoned his hadith
Al-Daraqutni: Among the abandoned, and once: He has falsehoods
Zakaria bin Yahya al-Saji: Liar
Ali ibn al-Madini: Weak Sheikh, and his weakness is severe
Muslim bin al-Hajjaj al-Nishapuri: Weak in Hadith