Mark 4:40

Then He asked them, "Why are you afraid? Have you no faith yet?"

Matthew 14:31

Jesus at once put out His hand and caught hold of him, and said to him, "O you of little faith! Why did you waver so?"

Luke 8:25

Then He said to them, "Where is your faith?" But they were frightened and astounded, and continued to say to one another, "Who can He be? For He gives orders even to the winds and the water, and they obey Him."

Matthew 6:30

Now if God so gorgeously dresses the wild grass which today is green but tomorrow is tossed into the furnace, will He not much more surely clothe you, O you with little faith?

Matthew 8:26

And He said to them, "Why are you afraid, O you with little faith?" Then He got up and rebuked the winds and the sea, and there was a great calm.

Matthew 16:8

Jesus knew it and said, "Why are you discussing among yourselves the fact that you have no bread? Have you so little faith?

John 6:19-20

When they had rowed about three or four miles, they saw Jesus walking on the sea and coming near the boat, and they were terror-stricken.

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 with little faith?" Then He got up and rebuked the winds and the sea, and there was a great calm.
Matthew 14:31
Jesus at once put out His hand and caught hold of him, and said to him, "O you of little faith! Why did you waver so?"
Luke 8:25
Then He said to them, "Where is your faith?" But they were frightened and astounded, and continued to say to one another, "Who can He be? For He gives orders even to the winds and the water, and they obey Him."
John 6:19
When they had rowed about three or four miles, they saw Jesus walking on the sea and coming near the boat, and they were terror-stricken.

No faith

Matthew 6:30
Now if God so gorgeously dresses the wild grass which today is green but tomorrow is tossed into the furnace, will He not much more surely clothe you, O you with little faith?
Matthew 16:8
Jesus knew it and said, "Why are you discussing among yourselves the fact that you have no bread? Have you so little faith?

General references

Matthew 16:11
How is it that you do not understand that I did not speak to you about bread, when I said, keep on guarding yourselves against the yeast of the Pharisees and the Sadducees?"