Abdullah bin Saad bin Abu Sarh used to write down the revelation for the Messenger of Allah ﷺ, but Satan caused him to slip, and he joined the disbelievers. The Messenger of Allah ﷺ ordered that he be killed on the day of the conquest of Mecca, but Uthman bin Affan sought protection for him, and the Messenger of Allah ﷺ granted him protection.
كان عبد الله بن سعد بن أبي سرح يكتب لرسول الله ﷺ فأزله الشيطان، فلحق بالكفار. فأمر به رسول الله ﷺ أن يقتل يوم الفتح فاستجار له عثمان بن عفان، فأجاره رسول الله ﷺ.
Reported by Abu Dawud (4358) and Nasai (4069), both from the hadith of Ali bin Husayn bin Waqid, from his father, from Yazid the grammarian, from Ikrima, from Ibn Abbas, who mentioned it. The wording given here is that of Abu Dawud. As for the wording of Nasai, Ibn Abbas said regarding Surah Nahl, "Whoever disbelieves in Allah after his belief, except one who is compelled while his heart remains firm in faith, but those who open their hearts to disbelief will have the wrath of Allah upon them, and for them is a great punishment" [Nahl 16:106], this was abrogated, with an exception made from it, for He said, "Then indeed your Lord, to those who emigrated after being persecuted and then fought and were patient, indeed your Lord, after that, is truly forgiving and merciful" [Nahl 16:110].This refers to Abdullah bin Saad bin Abu Sarh, who was later governor of Egypt. He used to write for the Messenger of Allah ﷺ, but Satan caused him to slip, and he joined the disbelievers. He was ordered to be killed on the day of the Conquest, but Uthman bin Affan sought protection for him, and the Messenger of Allah ﷺ granted him protection.Its chain of transmission is hasan because of Ali bin Husayn and his father, for the two of them render the hadith hasan. His story is well documented in the books of military campaigns and biographies, among them what Abu Dawud reported, which follows next.