Musnad Ahmad 31:577

'Abd al-Razzaq narrated to us, Sufyan informed us, from al-A'mash, from Abu Sufyan, from Jabir, who said: Abu Sa'id al-Khudri narrated to us that the Messenger of Allah, peace and blessings of Allah be upon him, said: "When one of you completes his prayer in the mosque, let him assign a portion of his prayer to his house, for indeed Allah will place good in his house from his prayer."