Mark 3:5

3:5 After looking around at them in anger, grieved by the hardness of their hearts, he said to the man, “Stretch out your hand.” He stretched it out, and his hand was restored.

Mark 8:17

8:17 When he learned of this, Jesus said to them, “Why are you arguing about having no bread? Do you still not see or understand? Have your hearts been hardened?