Narrated Abdullah ibn Mas'ud(rz) (abu-dawood)

Salam ibn Miskin, quoting an old man who witnessed AbuWa'il in a wedding feast, said: They began to play, amuse and sing. He united the support of his hand round his knees that were drawn up, and said: I heard Abdullah (ibn Mas'ud) say: I heard the apostle of Allah (peace be upon him) say: Singing produces hypocrisy in the heart.