It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Sayyiduna Ibrahim (peace be upon him) circumcised himself at the age of eighty years, and he circumcised himself with a 'qadum' (that is, an adze, or at the place called Qadum)."
Hadith Referenceمسند أبي يعلى الموصلي / مسند أبي هريرة رضي الله عنه / 5981
Hadith Takhrij«قال سعيد بن محمد السناري: صحيح» «أخرجه فتح الباري برقم: 3178، مسند ابویعلیٰ ترقیم الاثری: 5955»