Abdullah bin Ja'far bin 'Abdur Rahman عبد الله بن جعفر بن عبد الرحمن - المخرمي · The Book on Faith

that the Messenger of Allah (ﷺ) said: "The Jews split into seventy-one sects, or seventy-two sects, and the Christians similarly, and my Ummah will split into seventy-three sects."