عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ مِنَ الْفِطْرَةِ حَلْقُ الْعَانَةِ وَتَقْلِيمُ الْأَظَافِرِ وَقَصُّ الشَّارِبِ وَقَالَ إِسْحَاقُ رَضِيَ اللَّهُ عَنْهُ مَرَّةً وَقَصُّ الشَّوَارِبِ
Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that the Noble Prophet (peace and blessings be upon him) said: Shaving the hair below the navel, trimming the nails, and cutting the moustache are from the natural disposition (fitrah).