Did Jesus authorize the Septuagint Bible?
By reading from it----yes. The LXX was "the Bible" in His day.
The majority of Hebrew people in Jesus' day accepted the Septuagint as inspired by God.
They accepted the translation and what was translated to be under Divine protectorate.
Jesus utilized the Septuagint in his ministry, even reading aloud from it in public.
This is a fact.
The apostles often quote from the Septuagint when citing passages of the Old Testament.
Yes, another fact.
Does this usage constitute endorsement of the Septuagint as the official Word of God?
YES.
Jesus is the ulimate authority. When He was handed the scroll to read from, that is, when He read from Isaiah, Jesus was reading from the LXX. This constitutes total endorsement.
Now critics would argue that what He quoted differs from texts translated by English translators and, more importantly, translations of the LXX as they now exist. They would argue contradiction.
Not so.
I am not saying contradictions do not exist. I am saying that whatever Jesus read aloud as recorded by Luke IS the CORRECT translation. Any source that contradicts is error because Jesus is the ultimate authority, the Word of God Incarnate----the Logos of St. John.
Ray