When Negus died, the Prophet (ﷺ) said, "Today a pious man has died. So get up and offer the funeral prayer for your brother Ashama."
Sahih al-Bukhari Book 63, Hadith 102
← Previous Hadith We received the news of the departure of the Prophet (to Medina) while we were in Yemen. So we went on board a ship but our ship took us away to An-Najashi (the Negus) in Ethiopia. There we met Ja`far bin Abi Talib and stayed with him till we came (to Medina) by the time when the Prophet (ﷺ) had conquered Khaibar. The Prophet (ﷺ) said, "O you people of the ship! You will have (the reward of) two migrations."

Sahih al-Bukhari Book 63, Hadith 101 Next Hadith → Allah's Messenger (ﷺ) led the funeral prayer for the Negus and made us stand in rows behind him and I was in the second or third row.

Sahih al-Bukhari Book 63, Hadith 103