Mark 7:18

And he said to them, Are you also so without understanding? Do you not understand that nothing which enters into a man from without can defile him,

Matthew 15:16-17

And he said, Are you so entirely without understanding?

Matthew 16:11

Why do you not understand that I spoke to you not of bread, to beware of the leaven of the Pharisees and Sadducees?

Mark 4:13

And he said to them, Do you not know this parable? How then will you know all parables?

Luke 24:25

And he said to them, O foolish men, and of a mind slow to believe all that the prophets have spoken.

John 3:10

Jesus answered and said to him, Are you a teacher of Israel and know not these things?

1 Corinthians 3:2

I have fed you milk, not solid food; for you were not yet able; but you are not able even now;

Hebrews 5:11

Concerning whom we have much to say, and that which is difficult to explain, because you have become dull of hearing.

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