عَنْ أَبِي بَلْجٍ قَالَ قُلْتُ لِمُحَمَّدِ بْنِ حَاطِبٍ الْجُمَحِيِّ إِنِّي قَدْ تَزَوَّجْتُ امْرَأَتَيْنِ لَمْ يُضْرَبْ عَلَيَّ بِدُفٍّ قَالَ بِئْسَمَا صَنَعْتَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِنَّ فَصْلَ مَا بَيْنَ الْحَلَالِ وَالْحَرَامِ الصَّوْتُ يَعْنِي الضَّرْبَ بِالدُّفِّ وَفِي رِوَايَةٍ فَصْلُ مَا بَيْنَ الْحَلَالِ وَالْحَرَامِ الدُّفُّ وَالصَّوْتُ فِي النِّكَاحِ
Abu Balj says: I said to Muhammad bin Hatib Jumahi: I have married two women and no duff was played for me. He said: You have done wrong. The Noble Prophet (peace and blessings be upon him) said: The distinction between halal and haram is the sound, that is, playing the duff. In another narration it is: The thing that distinguishes between halal and haram is playing the duff and making sound.