وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ إِنِّي لأَنْسَى أَوْ أُنَسَّى لأَسُنَّ "
Yahya related to me from Malik that he had heard that the Messenger of Allah (ﷺ) said, "I forget or I am made to forget so that I may establish the sunna."
Reference: Sunnah.com : Book 4, Hadith 2
USC-MSA web (English) : Book 4, Hadith 2
Arabic : Book 4, Hadith 224