Ibn ‘Asakir reported: Malik ibn Anas, may Allah have mercy on him, said, “The Sunnah is like the Ark of Noah. Whoever boards it will be saved, and whoever does not board it will drown.”
Source: Tārīkh Dimashq 12275
عن ابن عساكر قَالَ مَالِك بن أنس رحمه الله السَّنَةُ سَفِينَةُ نُوحٍ مَنْ رَكِبَهَا نَجَا وَمَنْ تَخَلَّفَ عَنْهَا غَرَقَ
12275 تاريخ دمشق لابن عساكر