Second Pledge at Aqabah
Accounts on the life of Hazrat Abu Bakr Siddiq (ra) were being narrated. In relation to the second pledge at Aqabah, it is written that Hazrat Abu Bakr (ra), Hazrat Ali (ra) and the paternal uncle of the Holy Prophet (sa), Hazrat Abbas (ra), were with the Holy Prophet (sa). Hazrat Abbas (ra), who was the organiser of this meeting, appointed Hazrat Ali (ra) as a guard in one mountain pass and he appointed Hazrat Abu Bakr (ra) to guard and protect another mountain pass.
(Al-Sirat al-Halabiyyah, Vol. 2, p. 21, Dar-ul-Kutub al-Ilmiyyah, Beirut, 2002)