It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "If it pleases you to look at a foolish (feeble-minded) man who is obeyed among his people, then look at this man." He (peace and blessings be upon him) meant Uyaynah bin Hisn.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ishaq bin Abdullah bin Abi Talhah except Hilal bin al-Jahm; Umar bin Yunus is alone in narrating it."