Hebrews 4:3:

For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.

See also:

What Faith Isn’t
How to Tell If You’re in Faith or Not
Why You Might Not Want to Pray to Receive Your Healing Right Away
Don’t Do This
I Prayed in Faith – Now What?
How Long Does It Take to Build Faith for Healing That Works?