James 2:17-19

17 Even so faith, if it hath not works, is dead, being alone. 

18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works. 

19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble.