11 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?
Matthew 16:11 Cross References - KJV_Cambridge
Matthew 16:6
6 Then Jesus said unto them, Take heed and beware of the leaven of the Pharisees and of the Sadducees.
Mark 4:40
40 And he said unto them, Why are ye so fearful? how is it that ye have no faith?
Mark 8:21
21 And he said unto them, How is it that ye do not understand?
Luke 12:56
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
43 Why do ye not understand my speech? even because ye cannot hear my word.