It was narrated from Anas, that the Messenger of Allah had a female slave with whom he had intercourse, but 'Aishah and Hafsah would not leave him alone until he said that she was forbidden for him. Then Allah, the Mighty and Sublime, revealed:"O Prophet! Why do you forbid (for yourself) that which Allah has allowed to you.' until the end of the Verse

English translation · Sunan an-Nasa'i