Maliks Muwatta Book 046, Hadith Number 003.

Section : The Prohibition against Talking about the Decree.

Yahya related to me from Malik that he heard that the Messenger of Allah, may Allah bless him and grant him peace, said, "I have left two matters with you. As long as you hold to them, you will not go the wrong way. They are the Book of Allah and the Sunna of His Prophet."