Mark 4:40

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

Matthew 14:31

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

Luke 8:25

And he said to them, Where is your faith? And they feared and were astonished, saying one to another, Well! what a man is this! that he commands even the winds and the sea, and they obey him.

Matthew 6:30

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?

Matthew 8:26

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.

Matthew 16:8

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?

John 6:19-20

Having rowed therefore about five and twenty or thirty furlongs, they saw Jesus walking on the sea, and coming near the vessel, and they were affrighted.

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 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.
Matthew 14:31
Then immediately Jesus stretching out his hand, laid hold on him, and said to him, O thou of little faith, wherefore dost thou doubt?
Luke 8:25
And he said to them, Where is your faith? And they feared and were astonished, saying one to another, Well! what a man is this! that he commands even the winds and the sea, and they obey him.
John 6:19
Having rowed therefore about five and twenty or thirty furlongs, they saw Jesus walking on the sea, and coming near the vessel, and they were affrighted.

No faith

Matthew 6:30
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?
Matthew 16:8
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?

General references

Matthew 16:11
How is it that ye do not understand, that I spake not to you of bread, to beware of the leaven of the Pharisees and of the Sadducees?