It is narrated from Sayyiduna Sabrah bin Ma'bad (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) had given permission for mut'ah; then, three days later, when I reached him (peace and blessings be upon him), he (peace and blessings be upon him) was declaring it unlawful and forbidding it most severely.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6488