Yahya related to me from Malik that he had heard that theMessenger of Allah, may Allah bless him and grant him peace, said, "Iforget or I am made to forget so that I may establish the sunna." (ES)
App reference (ES): Book 4, Hadith 2 (ES)
USC-MSA web (English) reference: Book 4, Hadith 2 (ES)
Arabic reference (ES): Book 4, Hadith 224 (ES)