Sayyiduna Salman bin Sakhr al-Bayadi (may Allah be pleased with him) declared his wife to be like his mother's back to him if he went to her before Ramadan had passed. Then when half of Ramadan had passed, she grew plump and healthy, and she pleased him, so he had intercourse with her at night. Then he came to the Prophet (peace and blessings be upon him) and asked him about it. He (peace and blessings be upon him) said: "Free a slave." He said: I do not have one. He (peace and blessings be upon him) said: "Fast two consecutive months." He said: I do not have the strength. He (peace and blessings be upon him) said: "Feed sixty poor people." He said: I do not have the means. Then a faraq containing fifteen sa' of dates (or sixteen sa') was brought to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Take this and give it in charity to sixty poor people."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6302