'Little Faith' in the Bible

But if God so clothes the grass of the field, which today exists, and tomorrow is thrown into the oven, won't he much more clothe you, you of little faith?

He said to them, "Why are you fearful, O you of little faith?" Then he got up, rebuked the wind and the sea, and there was a great calm.

Immediately Jesus stretched out his hand, took hold of him, and said to him, "You of little faith, why did you doubt?"

Jesus, perceiving it, said, "Why do you reason among yourselves, you of little faith, 'because you have brought no bread?'