'Little Faith' in the Bible

If God then so clothe a vegetable of the field, which to-day is, [in beauty], and tomorrow is cast into the furnace, shall he not much more clothe you, O ye of little faith?

And he said unto them, Why are ye fearful, O ye of little faith? Then arising, he issued his mandate to the winds, and to the sea; and there was a great calm.

Then immediately Jesus stretching out his hand, laid hold on him, and said to him, O thou of little faith, wherefore dost thou doubt?

But when Jesus knew it, he said unto them, Why are ye reasoning among yourselves, O ye of little faith, because ye have not taken bread?