Sunan Abi Dawud 2399
سنن أبي داود#2399SahihNarrated '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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautHasan Sahih
Zubair Ali ZaiSahih Bukhari (1950) Sahih Muslim (1146)
In-book reference: 14:87