موطأ مالك
كتاب السهو
Book 4, Hadith 224
الإسناد
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏
المتن
"‏ إِنِّي لأَنْسَى أَوْ أُنَسَّى لأَسُنَّ ‏"
Yahya related to me from Malik that he had heard that the Messenger of Allah, may Allah bless him and grant him peace, said, "I forget or I am made to forget so that I may establish the sunna."