Prove what? That the septuagint is the oldest so-called biblical text?
http://en.wikipedia.org/wiki/Dating_the_Bible
Read it and weep, sonny.
http://en.wikipedia.org/wiki/Dating_the_Bible
Quote:The Bible is a compilation of various texts or "books" of different ages. The dates of some of the texts of the Hebrew Bible (or Old Testament) are difficult to establish.
The oldest surviving Hebrew Bible manuscripts date to about the 2nd century BC (fragmentary), the oldest record of the complete text survives in a 300-130 BC[1][2] Greek translation called the Septuagint, dating to the 4th century AD (Codex Sinaiticus) and the oldest extant manuscripts of the vocalized Masoretic text upon which modern editions are based date to the 9th century AD.
Read it and weep, sonny.