Musnad Ahmad 30:2602

Waki’ narrated to us, he said: Ibn Abi Dhi’b narrated to us, from Salih, the freed slave of al-Taw’amah, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever prays over a funeral in the mosque, there is nothing for him."