25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:
Luke 24:25 Cross References - KJC
Mark 7:18
18 And he says unto them, Are you so without understanding also? Do you not perceive, that whatsoever thing from outside enters into the man, it cannot defile him;
Mark 8:17-18
Mark 9:19
19 He answers him, and says, O faithless generation, how long shall I be with you? how long shall I endure you? bring him unto me.
Mark 16:14
14 Afterward he appeared unto the eleven as they sat at food, and upbraided them with their unbelief and hardness of heart, because they believed not those who had seen him after he was risen.
Hebrews 5:11-12
11 Of whom we have many things to say, and hard to be uttered, seeing you are dull of hearing.
12 For when for the time you ought to be teachers, you have need that one teach you again which be the first principles of the oracles of God; and have become such as have need of milk, and not of strong food.