Matthew 13:51

"Have you understood all this?" he asked. "We have," they answered him.

Matthew 15:16-17

He answered. "Are even you still without understanding?

Matthew 16:11

"How is it that you do not perceive that I did not speak to you concerning bread? But beware off the leaven of the Pharisees and Sadducees!"

Mark 4:13

"You do not understand this parable," said Jesus. "Then how will you understand the other parables?

Luke 9:45

But they did not understand this saying; it was hidden from them so that they perceived it not, and they were sore afraid to ask him about his saying.

Acts 8:30

So Philip ran up, and heard him reading Isaiah the Prophet, and said to him. "Do you understand what you are reading?"

Treasury of Scripture Knowledge

Summary

Say now to the rebellious house, Know ye not what these things mean? tell them, Behold, the king of Babylon is come to Jerusalem, and hath taken the king thereof, and the princes thereof, and led them with him to Babylon;

Bible References

Know

Matthew 13:51
"Have you understood all this?" he asked. "We have," they answered him.
Matthew 15:16
He answered. "Are even you still without understanding?
Matthew 16:11
"How is it that you do not perceive that I did not speak to you concerning bread? But beware off the leaven of the Pharisees and Sadducees!"
Mark 4:13
"You do not understand this parable," said Jesus. "Then how will you understand the other parables?
Luke 9:45
But they did not understand this saying; it was hidden from them so that they perceived it not, and they were sore afraid to ask him about his saying.
Acts 8:30
So Philip ran up, and heard him reading Isaiah the Prophet, and said to him. "Do you understand what you are reading?"