Musnad Ahmad 1153:725

Abu Sa’id narrated to us, he said: ‘Abd al-Rahman ibn Abi al-Rijal narrated to us, he said: I heard my father narrating from ‘Amrah, from ‘Aishah, who said: A woman came to the Messenger of Allah, may Allah bless him and grant him peace, and said: "May my father and mother be sacrificed for you, my son and I bought the fruit of the land of such-and-such person, and we came to him to ask him to reduce the price for us. By Allah, we did not obtain anything from his fruit, except for something we ate in our bellies, or fed to a poor person, hoping for the blessing." But he swore that he would not do so. The Messenger of Allah, may Allah bless him and grant him peace, said: "He swore that he would not do good, he swore that he would not do good, he swore that he would not do good." That reached the man, so he came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, if you wish, take the entire fruit, and if you wish, [take] what they have reduced." So he reduced for them what he reduced.