
From the life of Hazrat Abu Bakr as-Siddiq (ra)
With regards to Hazrat Abu Bakr being sent on an expedition towards Najd, it is written that Najd was a fertile region in the desert. It contains many mountains and valleys, to the south of it was Yemen, and to the north was the Syrian Desert and Iraq. To the west lies the Hijaz desert. This area was 1200 meters above sea level and owing to this elevation, this area became known as Najd.
(Sayyid Fadl al-Rahman, Farhang-e-Sirat [Karachi, Pakistan: Zawwar Academy Publications, 2003], p. 297)
In Najd, the Banu Kilab began preparing against the Muslims and so the Holy Prophet (sa) sent Hazrat Abu Bakr (ra) in order to quash this threat. This expedition took place in Sha‘ban, 7 AH.
Hazrat Salamah bin Akwa narrates that the Holy Prophet (sa) sent Hazrat Abu Bakr (ra) and appointed him the commander over them.
(Mustafa ‘Abd al-Wahid, Subul al-Huda wa al-Rashad fi Sirat Khair al-‘Ibad, Vol. 6, Sariyah Abi Bakr Ila Bani Kilab bi Najd [Beirut, Lebanon: Dar al-Kutub al-‘Ilmiyyah, 1993], p. 131)