'Little Faith' in the Bible

Therefore, if God so clothe the grass of the field, which today is, and tomorrow is cast into the oven, shall he not much more clothe you, O you of little faith?

And he said unto them, Why are you fearful, O you of little faith? Then he arose, and rebuked the winds and the sea; and there was a great calm.

And immediately Jesus stretched forth his hand, and caught him, and said unto him, O you of little faith, why did you doubt?

Which when Jesus perceived, he said unto them, O you of little faith, why reason you among yourselves, because you have brought no bread?