Matthew 13:51
"Have you understood all this?" He asked. "Yes," they said.
Matthew 15:16-17
"Are even you," He answered, "still without intellingence?
Matthew 16:11
How is it you do not understand that it was not about bread that I spoke to you? But beware of the yeast of the Pharisees and Sadducees."
Mark 4:13
"Do you all miss the meaning of this parable?" He added; "how then will you understand the rest of my parables?"
Luke 9:45
But they did not understand His meaning: it was veiled from them that they might not perceive it, and they were afraid to ask Him about it.
Acts 8:30
So Philip ran up and heard the eunuch reading the Prophet Isaiah. "Do you understand what you are reading?" he asked.