'Proverb' in the Bible

And he said unto them, Ye will surely say unto me this proverb, Physician, heal thyself: whatsoever we have heard done in Capernaum, do also here in thy country.

His disciples said unto him, Lo, now speakest thou plainly, and speakest no proverb.

But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.