The Book of Marriage
26/72. Chapter:
Announcing The Wedding By Singing And Beating The Duff
Sunan an-Nasai
أَخْبَرَنَا مُجَاهِدُ بْنُ مُوسَى، قَالَ حَدَّثَنَا هُشَيْمٌ، عَنْ أَبِي بَلْجٍ، عَنْ مُحَمَّدِ بْنِ حَاطِبٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " فَصْلُ مَا بَيْنَ الْحَلاَلِ وَالْحَرَامِ الدُّفُّ وَالصَّوْتُ فِي النِّكَاحِ " .
It was narrated that Muhammad bin Hatib said: "The Messenger of Allah said: 'What differentiates between the lawful and the unlawful is the Duff, and the voice (singing) for the wedding.'"
Reference : Sunan an-Nasa'i 3369In-book reference : Book 26, Hadith 174English translation : Vol. 4, Book 26, Hadith 3371