331. hadíth
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «إِنَّ اَلْمَجُوسَ جَزُّوا لِحَاهُمْ وَ وَفَّرُوا شَوَارِبَهُمْ وَ إِنَّا نَجُزُّ اَلشَّوَارِبَ وَ نُعْفِي اَللِّحَى وَ هِيَ اَلْفِطْرَةُ.
The Messenger of Allah (saws) said: "The Magians (Zoroastrians) trim their beards and let their mustaches grow long, but we trim the mustaches and let the beards grow, and this is the natural disposition (fitrah)."