John Chrysostom

[Isaiah] set his prophecy down in writing in a new book so that, after his prophecy was fulfilled, what he had written might bear witness against the Jews of what the inspired prophet predicted to them a long time before. This is why he did not simply write it in a book, but in a new book, a book capable of staying sturdy for a long time without easily falling apart, a book which could last until the events described in it would come to pass.