Musannaf Ibn Abi Shayba 3:3627

Abu Bakr narrated to us, he said: Waki' narrated to us, from Ibn Abi Dhi'b, from Abd al-Rahman ibn Mihran, from Abd al-Rahman ibn Sa'd, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The further and the further [one is] from the mosque, the greater the reward."