Mark 4:40

The wind fell, and there ensued a great calm. Then he said to them. "Why are you so afraid? Have you still no faith?"

Matthew 14:31

At once Jesus stretched out his hand and caught hold of him, saying to him. "O little faith! What made you doubt?"

Luke 8:25

"Where is your faith?" he asked them, In their terror they were filled with amazement, and said to one another, "Who is this who commands even the winds and the sea, and they obey him?"

Matthew 6:30

"If God then so clothes the grass of the field, which blooms today, and tomorrow is cast into the oven, will he not much more clothe you, you of little faith?

Matthew 8:26

"Why are you afraid?" he said, "you men of little faith!" Then he rose and rebuked the winds and the sea, and there came a great calm.

Matthew 16:8

When Jesus knew it he said: "Weaklings in faith! Why are you arguing among yourselves, because you have no bread?

John 6:19-20

After they had rowed three or four miles, they saw Jesus walking upon the sea, and drawing near to the boat, and they were terrified;

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 you afraid?" he said, "you men of little faith!" Then he rose and rebuked the winds and the sea, and there came a great calm.
Matthew 14:31
At once Jesus stretched out his hand and caught hold of him, saying to him. "O little faith! What made you doubt?"
Luke 8:25
"Where is your faith?" he asked them, In their terror they were filled with amazement, and said to one another, "Who is this who commands even the winds and the sea, and they obey him?"
John 6:19
After they had rowed three or four miles, they saw Jesus walking upon the sea, and drawing near to the boat, and they were terrified;

No faith

Matthew 6:30
"If God then so clothes the grass of the field, which blooms today, and tomorrow is cast into the oven, will he not much more clothe you, you of little faith?
Matthew 16:8
When Jesus knew it he said: "Weaklings in faith! Why are you arguing among yourselves, because you have no bread?

General references

Matthew 16:11
"How is it that you do not perceive that I did not speak to you concerning bread? But beware off the leaven of the Pharisees and Sadducees!"