More specifically, these principles are known as Usul al-Madhhab (principles of the Shia sect) according to Twelver Shias which differ from Daruriyat al-Din (Necessities of Religion) which are principles in order for one to be a Muslim. The Necessities of Religion do not include Leadership (Imamah) as it is not a requirement in order for one to be recognized as a Muslim. However, this category, according to Twelver scholars like Ayatollah al-Khoei, does include belief in God, Prophethood, the Day of Resurrection and other "necessities" (like belief in angels). In this regard, Twelver Shias draw a distinction in terms of believing in the main principles of Islam on the one hand, and specifically Shia doctrines like Imamah on the other.