“What differentiates between the lawful and the unlawful is (beating) the Daff and raising the voices (in song) at the time of marriage.” (Using translation from Ibn Mājah 1896)  

قَالَ رَسُولُ اللهِ ﷺ «فَصْلُ مَا بَيْنَ الْحَلَالِ وَالْحَرَامِ الدُّفُّ وَالصَّوْتُ فِي النِّكَاحِ»  

"The morning after the consummation of my marriage, the Prophet came and sat on my bed as far from me as you are sitting now, and our little girls started beating the Duff and reciting verses mourning my father who had been killed in the battle of Badr. One of them said: 'Among us is a Prophet who knows what will happen tomorrow.' On that the Prophet said: 'Stop saying this, and keep on saying what you were saying before.'" (Using translation from Tirmidhī 1090)   

دَخَلَ عَلَيَّ رَسُولُ اللهِ ﷺ غَدَاةَ بَنَى بِي فَجَلَسَ عَلَى فِرَاشِي وَجُوَيْرِيَاتٌ لَنَا يَضْرِبْنَ بِدُفٍّ وَيَنْدُبْنَ مَنْ قَتَلَ أَبَائِي فَقَالَتْ إِحْدَاهُنَّ وَفِينَا نَبِيٌّ يَعْلَمُ مَا فِي غَدِ فَقَالَ لَهَا اسْكُتِي عَنْ هَذَا وَقُولِي الَّذِي كُنْتِ تَقُولِينَ قَبْلَهَا