It was narrated from Ibn `Abbas that the Messenger of Allah (ﷺ) said:
"Every division that was allocated according to (the rules of) the Ignorance days, stands as it is, and every division that was allocated according to (the rules of) Islam, stands according to the rules of Islam."
English reference: Vol. 3, Book 16, Hadith 2485
Arabic reference: Book 16, Hadith 2579