Sahih Bukhari | Volume 8 | Hadith Number 811A

Narrated by Abu Huraira
A person had sexual relation with his wife in the month of Ramadan (while he was fasting), and he came to Allah's Apostle seeking his verdict concerning that action. The Prophet said (to him), "Can you afford to manumit a slave?" The man said, "No." The Prophet said, "Can you fast for two successive months?" He said, "No." The Prophet said, "Then feed sixty poor persons."