It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "It is not lawful to buy or sell singing slave girls, nor is trading in them permitted, and consuming their price is unlawful," and concerning this Allah, the Mighty and Majestic, revealed this verse: "And among the people is he who buys idle talk" [Surah Luqman: 6].
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7831