The Prophet ﷺ said "Five things are in accordance with Al Fitra (i.e. the tradition of prophets): to be circumcised, to shave the pelvic region, to pull out the hair of the armpits, to cut short the moustaches, and to clip the nails.'  

عَنِ النَّبِيِّ ﷺ قَالَ الْفِطْرَةُ خَمْسٌ الْخِتَانُ وَالاِسْتِحْدَادُ وَنَتْفُ الإِبْطِ وَقَصُّ الشَّارِبِ وَتَقْلِيمُ الأَظْفَارِ  

that Messenger of Allah ﷺ said "The Prophet) Abraham circumcised himself after he had passed the age of eighty years and he circumcised himself with an adze."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «اخْتَتَنَ إِبْرَاهِيمُ بَعْدَ ثَمَانِينَ سَنَةً وَاخْتَتَنَ بِالْقَدُومِ مُخَفَّفَةً۔» حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا الْمُغِيرَةُ عَنْ أَبِي الزِّنَادِ وَقَالَ بِالْقَدُّومِ وَهُوَ مَوْضِعٌ مُشَدَّدٌ  

Ibn 'Abbas was asked, "How old were you when the Prophet ﷺ died?" He replied. "At that time I had been circumcised." At that time, people did not circumcise the boys till they attained the age of puberty. Sa'id bin Jubair said, "Ibn 'Abbas said, 'When the Prophet died, I had already been circumcised. "  

سُئِلَ ابْنُ عَبَّاسٍ مِثْلُ مَنْ أَنْتَ حِينَ قُبِضَ النَّبِيُّ ﷺ قَالَ أَنَا يَوْمَئِذٍ مَخْتُونٌ قَالَ وَكَانُوا لاَ يَخْتِنُونَ الرَّجُلَ حَتَّى يُدْرِكَ  

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

عَنِ ابْنِ عَبَّاسٍ قُبِضَ النَّبِيُّ ﷺ وَأَنَا خَتِينٌ