Muwatta Malik #682
Fasting
Malik said, "I have heard people of knowledge saying that the kaffara specified by the Messenger of Allah, may Allah bless him and grant him peace, for a man who has intercourse with his wife during the day in Ramadan is not due from someone who, on a day when he is making up the fast of Ramadan, breaks his fast by having intercourse with his wife, or whatever. He only has to make up for that day." Malik said, "This is what I like most out of what I have heard about the matter."
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About Muwatta Malik
This hadith is #682 from Muwatta Malik, in the Book of Fasting. Muwatta Malik contains 1,985 hadiths across 61 books.