How is it that ye do not understand that I spake it not to you concerning bread, that ye should beware of the leaven of the Pharisees and of the Sadducees?
Mark 4:40
And he said unto them, Why are ye so fearful? how is it that ye have no faith?
Mark 8:21
And he said unto them, How is it that ye do not understand?
Luke 12:56
Ye hypocrites, ye can discern the face of the sky and of the earth; but how is it that ye do not discern this time?
John 8:43
Why do ye not understand my speech? even because ye cannot hear my word.