Matthew 13:51
"Do you understand all this?" They said to him, "Yes."
Matthew 15:16-17
He said, "Have even you no understanding yet?
Matthew 16:11
Why do you not see that I was not talking to you about bread? But be on your guard against the yeast of the Pharisees and Sadducees!"
Mark 4:13
And Jesus said, "If you do not understand this figure, then how will you understand my other figures?
Luke 9:45
But they did not understand what he meant, indeed it was concealed from them, in order that they might not comprehend it, and they were afraid to ask him what he meant.
Acts 8:30
Philip ran up and heard him reading the prophet Isaiah, and he said to him, "Do you understand what you are reading?"