What were Abu Bakr and `Umar arguing about when the Verse 'O you who believe! Be not for ward......' (49.1) was revealed to the Prophet Muhammad (saw)?
 Narrated `Abdullah bin Az-Zubair:                     A group of Bani Tamim came to the Prophet (and requested him to appoint a governor for them). Abu Bakr said, "Appoint Al-Qaqa bin Mabad." `Umar said, "Appoint Al-Aqra' bin Habeas." On that Abu Bakr said (to `Umar). "You did not want but to oppose me!" `Umar replied "I did not intend to oppose you!" So both of them argued till their voices grew loud. So the following Verse was revealed: 'O you who believe! Be not for ward......' (49.1)