Mark 4:40

And he said to them, Why are ye so fearful? How is it that ye have not faith?

Matthew 14:31

And Jesus immediately stretched out his hand, and took hold of him, and said to him, Thou of little faith, why didst thou doubt?

Luke 8:25

And he said to them, Where is your faith? And they were afraid, and wondered, saying one to another, Who then is this, that he commandeth even the winds and the water, and they obey him?

Matthew 6:30

And if God so clothes the herbage of the field, which today is, and tomorrow is cast into an oven, will he not much more clothe you, O ye of little faith?

Matthew 8:26

And he saith to them, Why are ye fearful, ye of little faith? Then he arose, and rebuked the winds and the waves; and there was a great calm.

Matthew 16:8

And Jesus knowing it, said, Why are ye reasoning among yourselves, ye of little faith, because ye took no bread?

John 6:19-20

When therefore they had rowed about twentyfive or thirty furlongs, they saw Jesus walking on the lake, and drawing near the boat; and they were afraid.

Treasury of Scripture Knowledge

Summary

And he said unto them, Why are ye so fearful? how is it that ye have no faith?

General references

Bible References

Why

Matthew 8:26
And he saith to them, Why are ye fearful, ye of little faith? Then he arose, and rebuked the winds and the waves; and there was a great calm.
Matthew 14:31
And Jesus immediately stretched out his hand, and took hold of him, and said to him, Thou of little faith, why didst thou doubt?
Luke 8:25
And he said to them, Where is your faith? And they were afraid, and wondered, saying one to another, Who then is this, that he commandeth even the winds and the water, and they obey him?
John 6:19
When therefore they had rowed about twentyfive or thirty furlongs, they saw Jesus walking on the lake, and drawing near the boat; and they were afraid.

No faith

Matthew 6:30
And if God so clothes the herbage of the field, which today is, and tomorrow is cast into an oven, will he not much more clothe you, O ye of little faith?
Matthew 16:8
And Jesus knowing it, said, Why are ye reasoning among yourselves, ye of little faith, because ye took no bread?

General references

Matthew 16:11
How is it that ye do not understand, that I spoke not to you of loaves? But [I said] Beware of the leaven of the Pharisees and Sadducees.