Muwatta Malik 1625

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 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

Reference

Muwatta Malik 1625

In-book

Book 46, Hadith 3