Bible Verses About Reproof: Not understanding

Do ye not yet understand, neither remember the five loaves of the five thousand, and how many baskets ye took up?

How is it that ye do not understand that I spake it not to you concerning bread, that ye should beware of the leaven of the Pharisees and of the Sadducees?

And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him;

Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:

Why do ye not understand my speech? even because ye cannot hear my word.

Jesus answered and said unto him, What I do thou knowest not now; but thou shalt know hereafter.

Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.