Sunan an-Nasa'i, Volume 6, Book 48, Hadith 5045 (DarusSalam) ⓘ
It was narrated that Talq bin Habib said: "Ten things are from the Sunnah: Using the Siwak, trimming the mustache, rinsing the mouth, rinsing the nose, letting the beard grow, trimming the nails, plucking the armpit hairs, circumcision, shaving the pubes and washing one's backside."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ أَبِي بِشْرٍ، عَنْ طَلْقِ بْنِ حَبِيبٍ، قَالَ عَشْرَةٌ مِنَ السُّنَّةِ السِّوَاكُ وَقَصُّ الشَّارِبِ وَالْمَضْمَضَةُ وَالاِسْتِنْشَاقُ وَتَوْفِيرُ اللِّحْيَةِ وَقَصُّ الأَظْفَارِ وَنَتْفُ الإِبْطِ وَالْخِتَانُ وَحَلْقُ الْعَانَةِ وَغَسْلُ الدُّبُرِ . قَالَ أَبُو عَبْدِ الرَّحْمَنِ وَحَدِيثُ سُلَيْمَانَ التَّيْمِيِّ وَجَعْفَرِ بْنِ إِيَاسٍ أَشْبَهُ بِالصَّوَابِ مِنْ حَدِيثِ مُصْعَبِ بْنِ شَيْبَةَ وَمُصْعَبٌ مُنْكَرُ الْحَدِيثِ .
also referenced under: Hadith 5042 (Reference) & Book 48, Hadith 3 (In-Book)