Musnad Ahmad 733:0

Ubayd Allah ibn Aslam, the freed slave of the Prophet (peace and blessings of Allah be upon him), said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Every child of Adam is a master; the man is a master over his family, and the woman is a master over her house." He said: And I heard him say: "Whoever feeds a Muslim until he is full, Allah will keep him away from the Fire for a distance of seven trenches, the distance between each two trenches being like the distance between the heavens and the earth."