For ten years I heard him say, "I heard the Messenger of Allah ﷺ say, 'Whoever follows a funeral procession and helps carry the bier three times has fulfilled his duty toward it.'"
حدثنا محمد بن بشار حدثنا روح بن عبادة حدثنا عباد بن منصور قال سمعت أبا المهزم قال صحبت
عشر سنين سمعته يقول سمعت رسول الله ﷺ يقول من تبع جنازة وحملها ثلاث مرات فقد قضى ما عليه من حقها
No references are available.
[Its isnad is extremely daif]. Abul-Mahzam is discarded as a narrator (Taqrib). Ibn Abu Shayba narrated it (3/283, no. 11282) through Abbad bin Mansur, as a mawquf report.