Musnad Ahmad 30:3527

Ibn ‘Amir narrated to us, Abu Bakr informed us, from Hisham, from Muhammad, from Abu Hurairah, who said: A man entered upon his family, and when he saw the need they were in, he went out to the wilderness. When his wife saw that, she stood up to the hand-mill and set it in place, and to the oven and stoked it, then she said: "O Allah, provide for us." She looked, and behold, the kneading bowl was full. He said: And she went to the oven and found it full. He said: The husband returned and said: "Did you obtain anything after I left?" His wife said: "Yes, from our Lord." He stood up to the hand-mill. He mentioned that to the Prophet, peace and blessings of Allah be upon him, and he said: "Verily, had he not lifted it, it would have continued to turn until the Day of Resurrection." I witnessed the Prophet, peace and blessings of Allah be upon him, while he was saying: "By Allah, for one of you to take a rope, then carry it and sell it, so that he may seek chastity through it, is better for him than to come to a man and ask him."