مسند أحمد

It was narrated from ‘Ali (رضي الله عنه) that The Prophet (ﷺ) said: `No one (truly) believes until he believes in four things; until he believes that there is no god but Allah and that I am the Messenger of Allah (ﷺ) Who sent me with the truth, and until he believes in the resurrection after death, and until he believes in the divine will and decree.”