Mark 4:40

And He said unto them, Why are ye so fearful? how! have ye no faith?

Matthew 14:31

And Jesus, immediately stretching forth his hand, laid hold of him, and saith to him, O man of little faith, wherefore didst thou doubt?

Luke 8:25

And He said unto them, Where is your faith? But they were struck with awe and amazement, and said one to another, who is this? for He commandeth even the winds and the sea, and they obey Him.

Matthew 6:30

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

Matthew 8:26

Why are ye so frighted, O ye of little faith? Then He rose up and rebuked the winds and the sea, and there was a great calm.

Matthew 16:8

And Jesus knowing their thoughts said to them, O ye of little faith, why do ye argue among yourselves, because ye have brought no bread?

John 6:19-20

So when they had rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and near the ship: 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
Why are ye so frighted, O ye of little faith? Then He rose up and rebuked the winds and the sea, and there was a great calm.
Matthew 14:31
And Jesus, immediately stretching forth his hand, laid hold of him, and saith to him, O man of little faith, wherefore didst thou doubt?
Luke 8:25
And He said unto them, Where is your faith? But they were struck with awe and amazement, and said one to another, who is this? for He commandeth even the winds and the sea, and they obey Him.
John 6:19
So when they had rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and near the ship: and they were affrighted.

No faith

Matthew 6:30
Now if God so clothe the grass of the field, which is growing to-day, and to-morrow is cast into the fire, will He not much more clothe you, O ye of little faith?
Matthew 16:8
And Jesus knowing their thoughts said to them, O ye of little faith, why do ye argue among yourselves, because ye have brought no bread?

General references

Matthew 16:11
How is it then that ye do not understand that I did not speak to you concerning bread, when I bid you to beware of the leaven of the pharisees and of the sadducees?