Mukhtasar Muslim

It is narrated from Sayyiduna Sabrah Juhani, may Allah be pleased with him, that he was with the Messenger of Allah, peace and blessings be upon him. The Prophet said: "O people! I had permitted you to contract temporary marriage (mut'ah) with women, but now Allah Almighty has made it unlawful until the Day of Resurrection. So, whoever has any of these women (i.e., women of mut'ah) with him should let her go, and do not take back anything you have given them."