حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا زَكَرِيَّا بْنُ أَبِي زَائِدَةَ، عَنْ مُصْعَبِ بْنِ شَيْبَةَ، عَنْ طَلْقِ بْنِ حَبِيبٍ، عَنِ ابْنِ الزُّبَيْرِ، عَنْ عَائِشَةَ، قَالَتْ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ عَشْرٌ مِنَ الْفِطْرَةِ قَصُّ الشَّارِبِ وَإِعْفَاءُ اللِّحْيَةِ وَالسِّوَاكُ وَالاِسْتِنْشَاقُ بِالْمَاءِ وَقَصُّ الأَظْفَارِ وَغَسْلُ الْبَرَاجِمِ وَنَتْفُ الإِبِطِ وَحَلْقُ الْعَانَةِ وَانْتِقَاصُ الْمَاءِ ‏"‏ ‏.‏ يَعْنِي الاِسْتِنْجَاءَ ‏.‏ قَالَ زَكَرِيَّا قَالَ مُصْعَبٌ وَنَسِيتُ الْعَاشِرَةَ إِلاَّ أَنْ تَكُونَ الْمَضْمَضَةَ ‏.‏

It was narrated that 'Aishah said: "The Messenger of Allah said: 'Ten things are connected to the Fitrah: trimming the mustache, letting the beard grow, using the tooth stick, rinsing out the nostrils with water, clipping the nails, washing the joints, plucking the armpit hairs, shaving the pubic hairs, washing the private parts with water.'"(One of the narrators) Zakariyya said: "Mus'ab said: 'I have forgotten the tenth thing, but it may have been rinsing out the mouth.'" Translation Not Available

Book Ref: Sunan Ibn Majah Book 1 Hadith 293
Web Ref:  Sunan Ibn Majah Vol 1 Book 1 Hadith 293