"The Messenger of Allah said: 'Whoever follows a Janazah until it is finished, he will have two Qirats, and whoever goes back before it is finished, he will have one Qirat."
Sunan an-Nasa'i Book 21, Hadith 124
← Previous Hadith "I heard Al-Bara' bin 'Azib say: The Messenger of Allah said: 'whoever follows a Janazah until the prayer is offered, he will have one Qirat of reward and whoever walks with the funeral until (the body) is buried will have two Qirats of reward, and a Qirat is like Uhud."'

Sunan an-Nasa'i Book 21, Hadith 123 Next Hadith → "The Messenger of Allah said: The riders should move behind the Janazah and the pedestrian may walk wherever he wishes, and the (funeral) prayer should be offered for a child."'

Sunan an-Nasa'i Book 21, Hadith 125