LXX Levi

       Even if it was real, the Septuagint could not have been a legitimate copy of scripture.

        The claim for the Septuagint (AKA: LXX [70]) is that six scholars from each of the 12 tribes of Israel got together and translated the Hebrew Old Testament into Greek before the time of Christ, and Christ and the apostles quoted from the LXX. Never mind the fact that 12 x 6 = 72 instead of 70. That is a minor glitch compared to the major errors in the text. Many LXX proponents claim only the law (AKA: Pentateuch, books of Moses) was fully translated.

        We don't even have to investigate the major errors of the LXX, like having Methuselah survive the flood, or Goliath being only about 6 1/2 feet tall (and the NT mss that accompany them have goofs like having death swallowed up in "controversy" instead of victory, or having Jesus killed by the soldier's spear rather than willingly giving up the ghost prior to that). The LXX doesn't even get out of the batter's box. If members of each of the 12 tribes were responsible for it, that would make it an illegitimate scripture. The Old Testament was committed to the priestly tribe of Levi alone.

Deut 31:24-26 And it came to pass, when Moses made an end of writing the words of this law in a book, until they were finished, That Moses commanded the Levites, which bare the ark of the covenant of the LORD, saying, Take this book of the law, and put it in the side of the ark of the covenant of the LORD your God, that it may be there for a witness against thee.      

The covenant of Levi was with this tribe alone, to copy and guard the Old Testament Hebrew Scriptures, particularly the law.

Mal 2:7-8 For the priest's lips should keep knowledge, and they should seek the law at his mouth: for he is the messenger of the LORD of hosts. But ye are departed out of the way; ye have caused many to stumble at the law; ye have corrupted the covenant of Levi, saith the LORD of hosts.

Deut 17:18-19  And it shall be, when he sitteth upon the throne of his kingdom, that he shall write him a copy of this law in a book out of that which is before the priests the Levites: And it shall be with him, and he shall read therein all the days of his life: that he may learn to fear the LORD his God, to keep all the words of this law and these statutes, to do them: [The king was to write his own personal copy of the law, which would force him to meditate on it. He got the official law from the priestly Levites.]

Ezra 7:6 This Ezra went up from Babylon: and he was a ready scribe in the law of Moses, which the LORD God of Israel had given. [Ezra was a Levite and a scribe of the law of God.]

1 Chron 16:4 And he appointed certain of the Levites to minister before the ark of the LORD, and to record, and to thank and praise the LORD God of Israel:

2 Chron 34:13-15  ... of the Levites there were scribes, and officers, and porters. ... Hilkiah the priest found a book of the law of the LORD given by Moses.  And Hilkiah answered and said to Shaphan the scribe, I have found the book of the law in the house of the LORD.
Not only that, but the claim is the 72 scholars met in Egypt to compile the LXX. That violates:

Deut 17:16 But he shall not ... cause the people to return to Egypt, ... forasmuch as the LORD hath said unto you, Ye shall henceforth return no more that way.        

After the New Testament was written, the scripture was translated into many languages (Acts 2:9-12). All believers in Christ became priests and responsible for the scripture (1 Tim 3:15), but before the NT was written, the OT was only legitimate under the care of the tribe of Levi.