Matthew 8:26

8:26 But he said to them, “Why are you cowardly, you people of little faith?” Then he got up and rebuked the winds and the sea, and it was dead calm.

Matthew 14:31

14:31 Immediately Jesus reached out his hand and caught him, saying to him, “You of little faith, why did you doubt?”

Matthew 16:8

16:8 When Jesus learned of this, he said, “You who have such little faith! Why are you arguing among yourselves about having no bread?

Matthew 17:17

17:17 Jesus answered, “You unbelieving and perverse generation! How much longer must I be with you? How much longer must I endure you? Bring him here to me.”

Mark 4:40

4:40 And he said to them, “Why are you cowardly? Do you still not have faith?”

Mark 9:19

9:19 He answered them, “You unbelieving generation! How much longer must I be with you? How much longer must I endure you? Bring him to me.”

Luke 9:41

9:41 Jesus answered, “You unbelieving and perverse generation! How much longer must I be with you and endure you? Bring your son here.”

John 20:27

20:27 Then he said to Thomas, “Put your finger here, and examine my hands. Extend your hand and put it into my side. Do not continue in your unbelief, but believe.”

Hebrews 3:12

3:12 See to it, brothers and sisters, that none of you has an evil, unbelieving heart that forsakes the living God.