(7) باب بَيَانِ مَعْنَى قَوْلِهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ شَهْرَا عِيدٍ لَا يَنْقُصَانِ
The son of Abu Bakra reported it on the authority of his father that the Messenger of Allah (ﷺ) had said:
The two months of 'Id, Ramadan and Dhu'l-Hijja (are not incomplete).
Reference: Sahih Muslim 1089 a
In-book reference: Book 13, Hadith 37
USC-MSA web (English) reference(deprecated numbering scheme): Book 6, Hadith 2394