Hadith 692
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.
Hadith 693
Narrated Anas: The Prophet said, "Listen and obey (your chief) even if an Ethiopian whose head is like a raisin were made your chief."