Reference: Ibn ‘Abdul Barr in Jaami’ Bayaan al-‘Ilm (2/32), Ibn Hazm, quoting from the former in Usool al-Ahkaam (6/149), and similarly Al-Fulaani (p. 72)
Imaam Maalik ibn Anas (rahima-hullaah) said:
Truly I am only a mortal: I make mistakes [sometimes] and I am correct [sometimes]. Therefore, look into my opinions: all that agrees with the Book and the Sunnah, accept it; and all that does not agree with the Book and the Sunnah, ignore it.