John 13:12

So, after Jesus had washed His disciples' feet and put His [outer] clothing back on, He reclined again [at the dinner table] and said to them, "Do you understand what I have done to you?

John 13:7

Jesus answered him, "You do not understand what I am doing, but you will later on."

Matthew 13:51

"Have you understood all these things?" [Jesus asked]. "Yes," they said to Him.

Mark 4:13

And Jesus continued to speak to them, "Do you not know what this parable means? Then how can you understand any of the other parables?

John 13:4

So, He got up from the dinner table, laid aside His [outer] clothing and took a towel and wrapped it around Himself.

Treasury of Scripture Knowledge

Summary

So after he had washed their feet, and had taken his garments, and was set down again, he said unto them, Know ye what I have done to you?

Bible References

Know

John 13:7
Jesus answered him, "You do not understand what I am doing, but you will later on."
Matthew 13:51
"Have you understood all these things?" [Jesus asked]. "Yes," they said to Him.
Mark 4:13
And Jesus continued to speak to them, "Do you not know what this parable means? Then how can you understand any of the other parables?