´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).'"
Hadith ReferenceSunan an-Nasa'i / The Book of Marriage / Hadith: 3372
Hadith Gradingالألبانی:حسن | زبیر علی زئی:إسناده حسن