Sahih al-Bukhari 3798

From Abu Hurayra who said, "A man came to the Prophet, may Allah bless him and grant him peace, and he sent to his wives who said, 'We have nothing but water.' The Messenger of Allah, may Allah bless him and grant him peace, said, 'Who will take this man - or give him hospitality ?' A man of the Ansar said, 'I will, Messenger of Allah.' He took him to his wife and said , 'Honour the guest of the Prophet, may Allah bless him and grant him peace.' She said, 'We only have the children's food.' He said, 'Prepare your food and light your lamp and put your children to sleep when they want supper.' So she prepared her food, lit your lamp and put her children to sleep. Then she went as if she was tending her lamp and put it out. They began to pretend to be eating, but they spent the night hungry. In the morning, he went to the Messenger of Allah, may Allah bless him and grant him peace, and he said, 'Allah was pleased with - or likes - what you did - last night.' Then Allah sent down, 'But they give preference over themselves, even though poverty was their (own lot). And those saved from the covetousness of their own souls - they are the ones that achieve prosperity.'"