Sahih al-Bukhari Book 10, Hadith 87

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.

Previous Hadith

The Prophet (ﷺ) said, "Isn't he who raises his head before the Imam afraid that Allah may transform his head into that of a donkey or his figure (face) into that of a donkey?"

Sahih al-Bukhari Book 10, Hadith 86
Next Hadith

The Prophet (ﷺ) said, "Listen and obey (your chief) even if an Ethiopian whose head is like a raisin were made your chief."

Sahih al-Bukhari Book 10, Hadith 88