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Al-Adab al-Mufrad 1244
أَخْبَرَنَا شُعَيْبُ بْنُ أَبِي حَمْزَةَ، قَالَ: حَدَّثَنَا أَبُو الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ: اخْتَتَنَ إِبْرَاهِيمُ صلى الله عليه وسلم بَعْدَ ثَمَانِينَ سَنَةً، وَاخْتَتَنَ بِالْقَدُومِ قَالَ أَبُو عَبْدِ اللهِ: يَعْنِي مَوْضِعًا.
Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Ibrahim, may Allah bless him and grant him peace, was circumcised when he was eighty years old. He was circumcised with an axe (qadum)."
Cited in Al-Adab al-Mufrad (No. 1244).