Harun bin Ishaq bin Muhammad هارون بن إسحاق بن محمد بن مالك · The Book of Marriage

It was narrated that 'Aishah, may Allah be pleased with her, said: "The Messenger of Allah gave his wives the choice (of staying with him) was it divorce?"

"I heard Muhammad bin Hatib say: 'What differentiates between the lawful and the unlawful is the voice (singing).'"