Musannaf Ibn Abi Shayba 13:3061

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Muhammad ibn Abdullah narrated to us, from al-Sha’bi, from Makhul, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Take your right in chastity, whether it is fulfilled or not fulfilled."