Sayyiduna al-Harith bin Ghaziyyah (may Allah be pleased with him) said: I heard the Prophet (peace and blessings be upon him) say three times on the day of the Conquest of Makkah: "Mut'ah (temporary marriage) with women is forbidden."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3378