Sayyiduna Rafi' bin Abi Rafi' al-Ta'i (may Allah be pleased with him) said: When the expedition of Dhat al-Salasil took place, the Messenger of Allah (peace and blessings be upon him) appointed Sayyiduna Amr bin al-As (may Allah be pleased with him) as commander of an army in which Sayyiduna Abu Bakr (may Allah be pleased with him) was also included.
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4454