IBNHIBBAN 325:
from ʿAbd al-Raḥman b. Abū Bakrah from his father —
The Prophet ﷺ as saying: The two months of 'Id (festival), Ramadan and Dhu al-Hijjah, are not defective. (Using translation from Abū Dāʾūd 2323)
ابن حبّان ٣٢٥:
عن عبد الرحمن بن ابو بكره عن أبيه —
عَنِ النَّبِيِّ ﷺ قَالَ «شَهْرَا عِيدٍ لَا يَنْقُصَانِ رَمَضَانُ وَذُو الْحِجَّةِ»