عَنْ أَبِي أُمَامَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ قُلْنَا يَا رَسُولَ اللَّهِ إِنَّ أَهْلَ الْكِتَابِ يَقُصُّونَ عَثَانِينَهُمْ وَيُوَفِّرُونَ سِبَالَهُمْ قَالَ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قُصُّوا سِبَالَكُمْ وَوَفِّرُوا عَثَانِينَكُمْ وَخَالِفُوا أَهْلَ الْكِتَابِ
Sayyiduna Abu Umamah (may Allah be pleased with him) narrates that we said: O Messenger of Allah! The People of the Book trim their beards and let their mustaches grow. The Noble Prophet (peace and blessings be upon him) said: Trim your mustaches and let your beards grow, and oppose the People of the Book.