Musnad Ahmad 30:572

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, al-Harith ibn 'Abd al-Muttalib informed me—and Ibn Bakr said: Ibn 'Abd al-Malik—that Nafi' ibn Jubayr informed him, that Abu Hurayrah informed him, that he heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Whoever prays over a funeral and follows it, for him is two qirats like Uhud. And whoever prays and does not follow it, for him is a qirat like Uhud." Ibn Bakr said: The qirat is like Uhud.