Sahih al Bukhari 957
The Two Festivals (Eids)
حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ، قَالَ حَدَّثَنَا أَنَسٌ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ،. أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يُصَلِّي فِي الأَضْحَى وَالْفِطْرِ، ثُمَّ يَخْطُبُ بَعْدَ الصَّلاَةِ.
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) used to offer the prayer of `Id-ul-Adha and `Id-ul-Fitr and then deliver the Khutba after the prayer
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.