Sahih al-Bukhari 6300

Arabic

وَقَالَ ابْنُ إِدْرِيسَ عَنْ أَبِيهِ، عَنْ أَبِي إِسْحَاقَ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، قُبِضَ النَّبِيُّ صلى الله عليه وسلم وَأَنَا خَتِينٌ‏.‏

English translation

Sa'id ibn Jubair said, "Ibn 'Abbas said, 'When the Prophet (ﷺ) died, I had already been circumcised

Reference: Sahih al-Bukhari 6300, Book of Asking Permission. English translation by Dr. Muhammad Muhsin Khan.