Muwatta Malik 1673

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سَعِيدِ بْنِ أَبِي سَعِيدٍ الْمَقْبُرِيِّ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ خَمْسٌ مِنَ الْفِطْرَةِ تَقْلِيمُ الأَظَافِرِ وَقَصُّ الشَّارِبِ وَنَتْفُ الإِبْطِ وَحَلْقُ الْعَانَةِ وَالاِخْتِتَانُ ‏.‏

Yahya related to me from Malik from Said ibn Abi Said al-Maqburi from his father that Abu Hurayra said, "There are five things from the fitra:cutting the nails, trimming the moustache, removing the hair from the armpit, shaving the pubic region and circumcision

Reference

Muwatta Malik 1673

In-book

Book 49, Hadith 3