Mustadrak al-Hakim — Hadith 285M

I heard Abu al-Hasan Ali bin Umar al-Hafiz saying that he heard Abu al-Fadl the Wazir saying that he heard Ma'mun al-Misri, who said: I asked Abu Abd al-Rahman al-Nasa'i why Imam Bukhari abandoned the hadiths of Hammad bin Salamah. He replied: By Allah! Hammad bin Salamah is far better and more truthful than Isma'il bin Abi Uways. Then he mentioned a long account, the gist of which was a discussion about taking the narration of al-Harith bin Ubayd in place of the narration of Hammad.