Mark 4:40

He said to them, "Why are you so afraid? Have you no faith?"

Matthew 14:31

Jesus immediately reached out his hand and caught him, and said to him, "O you of little faith, why did you doubt?"

Luke 8:25

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

Matthew 6:30

Now if God so clothes the grass of the field, which today is, and tomorrow is thrown into the oven, will he not much more clothe you, O you of little faith?

Matthew 8:26

And he said to them, "Why are you afraid, O you of little faith?" Then he rose and rebuked the winds and the sea, and there was a great calm.

Matthew 16:8

But Jesus, aware of this, said, "O men of little faith, why do you discuss among yourselves the fact that you have no bread?

John 6:19-20

So when they had rowed about three or four miles, they saw Jesus walking on the sea 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 said to them, "Why are you afraid, O you of little faith?" Then he rose and rebuked the winds and the sea, and there was a great calm.
Matthew 14:31
Jesus immediately reached out his hand and caught him, and said to him, "O you of little faith, why did you doubt?"
Luke 8:25
He said to them, "Where is your faith?" And they were afraid, and they marveled, saying to one another, "Who then is this, that he commands even the winds and water, and they obey him?"
John 6:19
So when they had rowed about three or four miles, they saw Jesus walking on the sea and drawing near the boat; and they were afraid.

No faith

Matthew 6:30
Now if God so clothes the grass of the field, which today is, and tomorrow is thrown into the oven, will he not much more clothe you, O you of little faith?
Matthew 16:8
But Jesus, aware of this, said, "O men of little faith, why do you discuss among yourselves the fact that you have no bread?

General references

Matthew 16:11
How is it that you do not understand that I did not speak to you about bread? But beware of the leaven of the Pharisees and Sadducees."