American Standard Version (ASV):
In that day shall thy mouth be opened to him that is escaped, and thou shalt speak, and be no more dumb: so shalt thou be a sign unto them; and they shall know that I am Jehovah.
King James Version (KJV):
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.