It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) ordered a man who had broken his fast in Ramadan to "free a slave, or fast for two months, or feed sixty needy people."
Hadith Referenceالسنن المأثورة / باب ما جاء في الأذان / 288