Musnad Ahmad 33:280

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "When one of you completes the prayer in his mosque, let him assign a portion of his prayer to his house, for indeed Allah will place good in his house from his prayer."