Muhammad bin Abi Fadayk محمد بن إسماعيل بن مسلم بن أبي فديك · The Book of the Sunnah

"The Messenger of Allah (ﷺ) said: 'No slave truly believes until he believes in four things: in Allah alone with no partner; that I am the Messenger of Allah; in the resurrection after death; and in the Divine Decree (Qadar).'"