Ibn `Abbas (who was at that time a boy) said, "Allah's Messenger (ﷺ) came to a grave and the people said, 'He or she was buried yesterday.' " Ibn `Abbas added, "We aligned behind the Prophet (ﷺ) and he led the funeral prayer of the deceased."
Sahih al-Bukhari Book 23, Hadith 82
← Previous Hadith that Allah's Messenger (ﷺ) (p.b.u.h) said, "Whoever attends the funeral procession till he offers the funeral prayer for it, will get a reward equal to one Qirat, and whoever accompanies it till burial, will get a reward equal to two Qirats." It was asked, "What are two Qirats?" He replied, "Like two huge mountains."

Sahih al-Bukhari Book 23, Hadith 81 Next Hadith → Allah's Messenger (ﷺ) informed about the news of the death of An-Najash (King of Ethiopia) on the day he expired. He said, "Ask Allah's forgiveness for your brother. " Narrated Abu Huraira: The Prophet (ﷺ) made them align in rows at the Musalla and said four Takbir.

Sahih al-Bukhari Book 23, Hadith 83