Sahih Muslim | Book 6 | Chapter 7

Narrated by The son of Abu Bakra
The son of Abu Bakra reported it on the authority of his father that the Apostle of Allah

(may peace be upon him) had said: The two months of 'Id, Ramadan and Dhu'l-Hijja (are not incomplete).

Narrated by 'Abd Ar-Rahman b. Abu Bakra
'Abd Ar-Rahman b. Abu Bakra reported on the authority of Abu Bakra that the Apostle of Allah (may peace be upon him) had said: The months of 'Id are not incomplete. And in the hadith narrated by Khalid (the words are): "The months, of 'Id are Ramadan and Dhu'l-Hijja.