Abdullah B Amr Ibn Al As عبدالله بن عمرو ابن العاص
A devoted Companion of the Prophet (saws.) and a meticulous follower of his Sunan. He embraced Islam and migrated before his father. Although he had shown his ascetic tendencies much earlier, to the extent that the Prophet (saws) had to restrain him (by ordering him not to finish the Qur’anic recitation in less then three days, and not to fast beyond every alternate day), he participated, in all the campaigns led by the Prophet (saws) and took part in many battles after him against the Romans. He was one of those who used to write down by the Prophet's leave, what he heard from him. He called his compilation Saadiqah. He opposed his father over some political issues, but had to appear, because of him, on the side of Mu’awiyyah (ra) against ‘Ali (ra) in the battle of Siffin, although he did not participate in the fighting.
A report tells us that `Ammar ibn Yasir’s head was brought to Mu`awiyyah by two persons at Siffin, each claiming to have killed him. `Abdullah ibn `Amr ibn al-`Aas was there. He said he had heard the Prophet says that “the rebel party will kill `Ammar.” Mu`awiyyah asked shim, “So what explains your being on our side?” He replied, “Because, once something happened (between me and my father) and the Prophet told me, ‘Obey your father so long as he is alive; do not disobey him.’ He has ordered me to be on his side, so I am here. But I took no part in the battle
Appointed Governor of Kufa for a short while by Mu’awiyyah (ra), he refused to take the oath for his son Yezid, and retired for devotional activities to a place called, according to one report, ‘Asqalan. A well-built, red-complexioned man, he died in 63 or 65 H.
The Musnad of Ahmad has 627 narratives by him.