Musnad Ahmad 30:2737

Hajjaj and Yazid ibn Harun narrated to us, they said: Ibn Abi Dhi'b informed 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."