Hadith 3371
´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.'"
Hadith 3372
´It was narrated that Abu Balj said:` "I heard Muhammad bin Hatib say: 'What differentiates between the lawful and the unlawful is the voice (singing).'"