Muhammad bin al-Muthna - al-Zaman محمد بن المثنى أبو موسى - الزمن · The Chapters on Jihad

“This is Abu Dharr,” so he (the slave) started to move back. But Abu Dharr said: “My close friend (i.e., the Prophet (ﷺ)) told me to listen and obey, even if (the leader was) an Ethiopian slave with amputated limbs.”