Sunan Abi Dawud 2323
سنن أبي داود#2323SahihNarrated Abu Bakrah:The Prophet (ﷺ) as saying: The two months of 'Id (festival), Ramadan and Dhu al-Hijjah, are not defective
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
Zubair Ali ZaiSahih Bukhari (1912) Sahih Muslim (1089)
In-book reference: 14:11