St James 2:17-20

So faith also, if it have not works, is dead in itself. But some man will say: Thou hast faith, and I have works: shew me thy faith without works; and I will shew thee, by works, my faith. Thou believest that there is one God. Thou dost well: the devils also believe and tremble. But wilt thou know, O vain man, that faith without works is dead?