وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ تَرَكْتُ فِيكُمْ أَمْرَيْنِ لَنْ تَضِلُّوا مَا تَمَسَّكْتُمْ بِهِمَا كِتَابَ اللَّهِ وَسُنَّةَ نَبِيِّهِ ‏"‏ ‏.‏

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

Book reference: Muwatta Imam Malik Book 46 Hadith 1628
Web reference: Muwatta Imam Malik Book 46 Hadith 3