James 2:19

19 You believe that there is one God. Good! Even the demons believe that—and shudder.

Read James 2:19 Using Other Translations

Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
You believe that God is one; you do well. Even the demons believe--and shudder!
You say you have faith, for you believe that there is one God. Good for you! Even the demons believe this, and they tremble in terror.