Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) says: "Not every one of us heard hadith (directly) from the Messenger of Allah (peace and blessings be upon him); we had our own lands and occupations. But in those days people did not lie, so the one who was present (in the gathering) would narrate hadith to the one who was absent." This hadith is sahih on the condition of the two Shaykhs, but they did not record it. Muhammad bin Salim and his son Abdullah have been used as evidence, and Imam Bukhari included the Sahifah of Ibrahim bin Yusuf in his "Sahih".