'Dumb' in the Bible

And I will make thy tongue cleave to the roof of thy mouth, that thou shalt be dumb, and shalt not be to them a reprover: for they are a rebellious house.

In that day shall thy mouth be opened to him which is escaped, and thou shalt speak, and be no more dumb: and thou shalt be a sign unto them; and they shall know that I am the LORD.

Now the hand of the LORD was upon me in the evening, afore he that was escaped came; and had opened my mouth, until he came to me in the morning; and my mouth was opened, and I was no more dumb.