'Ali narrated that the Messenger of Allah (s.a.w) said:
'A slave (of Allah) shall not believe until he believes in four: The testimony of La Ilaha Illallah, and that I am the Messenger of Allah whom He sent with the Truth, and he believes in the death, and he believes in the Resurrection after death, and he believes in Al-Qadar."
English reference: Vol. 4, Book 6, Hadith 2145
Arabic reference: Book 32, Hadith 2295