Muhammad bin Ishaq (may Allah have mercy on him) says that Abu al-As (may Allah be pleased with him), after accepting Islam, returned to Makkah and did not take part in any battle with the Prophet (peace and blessings be upon him). After that he came to Madinah and died in Dhu al-Hijjah of the year 12 AH during the caliphate of Abu Bakr (may Allah be pleased with him), and he made al-Zubayr bin al-Awwam (may Allah be pleased with him) the executor of his will. Imam al-Shafi'i (may Allah have mercy on him) says that he used to order his armies to say to those who accepted Islam: "If you emigrate, you will receive what the Muhajirun receive, and if you do not emigrate, you will be like the Bedouin Muslims." And he gave them a choice only in what was lawful for them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17763