Abu Hurayrah (may Allah be pleased with him) said that a man came to the Prophet (peace and blessings be upon him) who had had intercourse with his wife in Ramadan. The Prophet (peace and blessings be upon him) said: "Free a slave." He said: I cannot find one. He (peace and blessings be upon him) said: "Then fast two consecutive months." He said: I am not able to do it. He (peace and blessings be upon him) said: "Feed sixty poor people." He said: I do not have the means. Then a basket containing fifteen sa' of dates 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." He said: O Messenger of Allah (peace and blessings be upon him)! I do not find anyone more in need of it than me and my household. He (peace and blessings be upon him) said: "Eat it, you and your household, fast one day in its place, and seek forgiveness."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8061