'Little Faith' in the Bible

And if God so clothes the grass of the field, which to-day is, and to-morrow is cast into the oven, will he not much more clothe you, men of little faith?

And he said to them, Why are you afraid, men of little faith? Then he arose, and rebuked the winds and the lake, and there was a great calm.

and Jesus immediately stretching out his hand, took hold of him and said, Man of little faith, why did you doubt?

But Jesus knowing it, said, Why do you reason within yourselves, men of little faith, because you have not taken bread?