Was There a Deutero Isaiah?

Was There a Deutero-Isaiah or Second Isaiah? There have been many critics who challenged the historicity of the Scriptures, and implied that the Bible is not the word of God. This is also true with the book of Isaiah, critics have identified problems in the books unity and authorship. A large number of critics make a case that Isaiah 1-39 and Isaiah 40-66 are two separate books written by two entirely different men. They refer to the second book as "Deutero- Isaiah" or "Second Isaiah" and they speculate that it was written during the Babylonian captivity, and the people that the author is addressing our different than in the first book. They also maintain that Isaiah is never mentioned as the author in the second book. but there are too many reasons for believing that Isaiah was the author of the whole book from Isaiah 1 through Isaiah 66. Jewish history and Jewish tradition never recognized anything other than one book, and one author. The discovery of the Dead Sea Scrolls identify Isaiah as one scroll, and thus one book. Judaism and Christianity also recognize Isaiah as one book and one author. The writing style of Isaiah is seen throughout both sections, and the people who are being addressed would apply more to Judah went to those captive in Babylon. There is also mention of Temple services in existence, which were not in existence what they were captive in Babylon. For these reasons and others, and for the fact that Jesus never recognized more than one Isaiah we must conclude that Isaiah was the author of his one book. It is important to understand this about the book of Isaiah because critics are always looking for something in which they might attack the Bible, especially the book of Isaiah because there are so many prophecies pointing to the life and ministry and even the death of the Lord Jesus Christ.

Link: https://bible-history.com/old-testament/bookofisaiah