'Little Faith' in the Bible

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

And he saith to them, Why are ye fearful, O ye 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 to him, O thou of little faith, Why didst thou doubt?

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