Musnad Ahmad 33:276

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