'Dumb' in the Bible

And were beyond measure astonished, saying, He hath done all things well: he maketh both the deaf to hear, and the dumb to speak.

And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit;

When Jesus saw that the people came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee, come out of him, and enter no more into him.