(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.'"
Reference: Sunan an-Nasa'i 3369
In-book reference: Book 26, Hadith 174
English translation: Vol. 4, Book 26, Hadith 3371