Here is my understanding of the Septuagint (for what it’s worth

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At the time of Christ there existed two canons of the Old Testament - the Hebrew and the Greek Septuagint. Due to the Hellenization of the eastern Mediterranean world after the conquests of Alexander the Great, Greek became the popular and common language of that part of the world
The Septuagint is the traditional term, derived from the Latin word meaning seventy, for the Old Greek translation of the Hebrew Scriptures. There were 72 translators of the Hebrew test into Greek – 6 from each of the tribes of Israel around 200 to 300 BC. This translation is the earliest and one of the most valuable of the ancient biblical versions. The Septuagint was the Bible of the early Christian Church. When the Bible is quoted in the New Testament, it is almost always from the Septuagint version (close to 90% of the time). Furthermore, even when not directly quoted in the New Testament, many of the terms used and partly crafted by the Septuagint translators became part of the language of the New Testament.
The Septuagint ***is the most ancient ***translation of the Old Testament and consequently is invaluable to critics for understanding and correcting the Hebrew text (Massorah), the latter, such as it has come down to us, being the text established by the Massoretes in the sixth century A.D. (as a response to the Christians using the Septuagint the Jews adopted the Hebrew version as their official cannon in the 6th century AD at the Council of Jamnia - more of a school than a council as we think of one today). Many textual corruptions, additions, omissions, or transpositions may have crept into the Hebrew text between the third and second centuries B.C. and the sixth and seventh centuries of our era; the manuscripts therefore which the Seventy had at their disposal, may in places have been better than the Massoretic manuscripts.
Disputes arose over the canon of Scripture due to the fact that the Greek Septuagint contains forty-six books while the Hebrew canon only thirty-nine. The additional books are Tobias, Judith, Wisdom, Ecclesiasticus, Baruch, and 1 & 2 Maccabees. In addition, the books of Daniel and Esther in the Septuagint contain extra chapters. One argument used to substantiate the Hebrew version over the Septuagint was that there were no versions of the omitted books found in Herbrew (argument used by the Jews and the Reformers), as mentioned earlier, the finding of the Dead Sea Scrolls made the argument moot point.
Stillkickin