Sunan Abi Dawud 2323
سنن أبي داود#2323Sahihحَدَّثَنَا مُسَدَّدٌ، أَنَّ يَزِيدَ بْنَ زُرَيْعٍ، حَدَّثَهُمْ حَدَّثَنَا خَالِدٌ الْحَذَّاءُ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرَةَ، عَنْ أَبِيهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ شَهْرَا عِيدٍ لاَ يَنْقُصَانِ رَمَضَانُ وَذُو الْحِجَّةِ " .
Narrated Abu Bakrah:The Prophet (ﷺ) as saying: The two months of 'Id (festival), Ramadan and Dhu al-Hijjah, are not defective
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Bukhari (1912) Sahih Muslim (1089)
In-book reference: 14:11