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 immediately Jesus reaching forth his hand, caught him, and saith to him, O thou of little faith, wherefore didst thou doubt?

Luke 8:25

And he said to them, Where is your faith? But they were afraid and wondered, saying one to another, What manner of man is this? For he commandeth even the winds and the water, and they obey him.

Matthew 6:30

Now: if God so clothe the grass of the field, which to day is, and to morrow is cast into the still, will he not much more clothe you, O ye of little faith?

Matthew 8:26

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

Matthew 16:8

Jesus knowing it said to them, O ye of little faith, why reason ye among yourselves, because ye have taken no bread?

John 6:19-20

And having rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and drawing nigh to the ship: 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, O ye of little faith? Then arising, he rebuked the winds and the sea, and there was a great calm.
Matthew 14:31
And immediately Jesus reaching forth his hand, caught him, and saith to him, O thou of little faith, wherefore didst thou doubt?
Luke 8:25
And he said to them, Where is your faith? But they were afraid and wondered, saying one to another, What manner of man is this? For he commandeth even the winds and the water, and they obey him.
John 6:19
And having rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and drawing nigh to the ship: and they were afraid.

No faith

Matthew 6:30
Now: if God so clothe the grass of the field, which to day is, and to morrow is cast into the still, will he not much more clothe you, O ye of little faith?
Matthew 16:8
Jesus knowing it said to them, O ye of little faith, why reason ye among yourselves, because ye have taken no bread?

General references

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