What did Salim, the slave of Abu Hudhaifa, do when the early emigrants arrived at Al-`Usba (a place in Quba') before the Prophet Muhammad (saw) did?
 Narrated Ibn `Umar:                     When the earliest emigrants came to Al-`Usba [??] a place in Quba', before the arrival of the Prophet- Salim, the slave of Abu Hudhaifa, who knew the Qur'an more than the others used to lead them in prayer.