It is narrated from Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever follows a funeral until the funeral prayer is offered over it will have one qirat of reward, and whoever walks with a funeral until it is buried will have two qirats of reward; and a qirat is like (the mountain of) Uhud."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Musayyab bin Rafi' except Burd; Abthar is alone in narrating it; and it is not narrated from Sayyiduna al-Bara' (may Allah be pleased with him) except with this chain."
Hadith Referenceالمعجم الأوسط / باب الميم / 7998
Hadith Takhrij«أخرجه النسائي فى «المجتبى» برقم: 1939 / 1، والنسائي فى «السنن الكبرى» برقم: 2078، وأحمد فى «مسنده» برقم: 18895، 18896، وابن أبي شيبة فى «مصنفه» برقم: 11742، والطحاوي فى «شرح مشكل الآثار» برقم: 1264، والطبراني فى «الأوسط» برقم: 1664»