Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) said: Abdullah bin Abi Sarh was a scribe of the Messenger (peace and blessings be upon him). Satan led him astray and he joined the disbelievers, so the Prophet (peace and blessings be upon him) ordered that he be killed. Sayyiduna Uthman (may Allah be pleased with him) sought protection for him, and he (peace and blessings be upon him) granted it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16829