Narrated ‘Ali reported that God’s messenger said, “A man is not a believer till he believes in four things:
he must testify that there is no god but God and that I am God’s messenger whom He sent with the truth ; he must believe in death and in the resurrection after death; and he must believe in the divine decree."
Anas reported that God’s messenger often said, “O Thou who turnest the hearts about, establish my heart in Thy religion.” Anas said, “Prophet of God, do you fear for us who believe in you and in your message?” He replied, “Yes. The hearts are between two of God’s fingers and He turns them about as He wills.”