(40) باب تَأْخِيرِ قَضَاءِ رَمَضَانَ
Narrated 'Aishah:
If I had some part of the fast of Ramadan to make up, I would not be able to atone for it except in Sha'ban. (ID)
Reference (ID): Sunan Abi Dawud 2399 (ID)
In-book reference (ID): Book 14, Hadith 87 (ID)
English translation (ID): Book 13, Hadith 2393 (ID)