Khalid bin Sa'id bin Amr bin Sa'id narrates from his father (Sa'id bin Amr) that when news of the passing of the Messenger of Allah (peace and blessings be upon him) reached his uncles Khalid, Aban and Amr (the sons of Sa'id bin al-As), they left their posts and came back. Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) said to them: "No one is more entitled to these posts than the governors appointed by the Messenger of Allah (peace and blessings be upon him); go back to your duties." But they replied: "We will not serve as governors for anyone after the Messenger of Allah (peace and blessings be upon him)." So they set out for Syria for jihad, and all of them were martyred there.