From Sahih Bukhari (Hadith 1320):
Narrated Jabir bin `Abdullah:The Prophet (ﷺ) said, "Today a pious man from Ethiopia (i.e. An Najashi) has expired, come on to offer the funeral prayer." (Jabir said): We lined up in rows and after that the Prophet (ﷺ) led the prayer and we were in rows. Jabir added, I was in the second row
Reference: Bukhari 1320