It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: Abdullah bin Abi Sarh used to write (the revelation) for the Messenger of Allah (peace and blessings be upon him). Then Satan made him slip, and he joined the disbelievers. So the Messenger of Allah (peace and blessings be upon him) ordered that he be killed. Then Sayyiduna Uthman (may Allah be pleased with him) sought protection for him, and the Messenger of Allah (peace and blessings be upon him) granted him protection. This hadith is sahih (authentic) on the condition of Imam Bukhari, but the two Shaykhs (Bukhari and Muslim) did not record it.