Musnad Ahmad 729:1

Yazid ibn Harun narrated to us, he said: Yahya ibn Sa'id informed us, from Bashir ibn Yasar, from al-Husayn ibn Mihsan, that an aunt of his came to the Prophet, peace and blessings of Allah be upon him, for a need. When she had finished her need, the Prophet, peace and blessings of Allah be upon him, said to her: "Are you married?" She said: "Yes." He said: "How are you toward him?" She said: "I do not neglect him, except for what I am unable to do." He said: "Look to where you stand in relation to him, for he is your Paradise and your Hellfire."