It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever gives people a fatwa without knowledge, its sin will be upon the one who gave the fatwa." This hadith is sahih on the condition of the two Shaykhs, but they did not record it, and I do not know of any hidden defect ('illah) in it.

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Do not write anything from me except the Qur'an, and whoever has written anything from me other than the Qur'an, let him erase it." This hadith is sahih on the condition of the two Shaykhs, but they did not record it. Mention of permission to write has already passed in the hadiths of Abdullah bin Amr (may Allah be pleased with them both).