(72) باب إِعْلاَنِ النِّكَاحِ بِالصَّوْتِ وَضَرْبِ الدُّفِّ .
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.'" (ID)
Reference (ID): Sunan an-Nasa'i 3369 (ID)
In-book reference (ID): Book 26, Hadith 174 (ID)
English translation (ID): Vol. 4, Book 26, Hadith 3371 (ID)