Maliks Muwatta Book 052, Hadith Number 002.

Section : Visions.

Yahya related to me from Malik from Ishaq ibn Abdullah ibn Abi Talha from Zufar ibn Sasaca from his father from Abu Hurayra that when the Messenger of Allah, may Allah bless him and grant him peace, left the morning prayer, he would say, "Has any of you had a dream last night? All that will remain of prophecy after me will be the true dream."