Matthew 13:51
Do you understand all these things? They say to Him, Yea.
Matthew 15:16-17
And Jesus said, Are you indeed still without understanding?
Matthew 16:11
How do you not understand that I did not speak to you concerning bread, to beware of the leaven of the Pharisees and the Sadducees.
Mark 4:13
And He says to them, Do you not understand this parable? and how will you know all parables?
Luke 9:45
And they did not understand this word, and it was hidden from them, in order that they should not understand it: and they were afraid to ask Him concerning this word.
Acts 8:30
And Philip running forth, heard him reading Isaiah the prophet, and said; Whether do you understand what you are reading?