34 For after the death of Alexander, the king of the Macedonians, and the division of his kingdom into four principalities, into Babylonia, and Macedonia, and Asia, and Egypt, one of those who reigned over Egypt, Ptolemy Philadelphus, being a king very fond of learning, while collecting the books that were in every place, heard from Demetrius Phalereus, the curator of his library, of the Divine Scriptures of the Law and the Prophets, and judged it much nobler, not to get the books from the possessors by force against their will, but rather to propitiate them by gifts and friendship; and knowing that what is extorted is often adulterated, being given unwillingly, while that which is willingly supplied is freely given with all sincerity, he sent to Eleazar, who was then High Priest, a great many gifts for the Temple here at Jerusalem, and caused him to send him six interpreters from each of the twelve tribes of Israel for the translation. Then, further, to make experiment whether the books were Divine or not, he took precaution that those who had been sent should not combine among themselves, by assigning to each of the interpreters who had come his separate chamber in the island called Pharos, which lies over against Alexandria, and committed to each the whole Scriptures to translate. And when they had fulfilled the task in seventy-two days, he brought together all their translations, which they had made in different chambers without sending them one to another, and found that they agreed not only in the sense but even in words. For the process was no word-craft, nor contrivance of human devices: but the translation of the Divine Scriptures, spoken by the Holy Ghost, was of the Holy Ghost accomplished.
Source: Catechetical Lectures (New Advent)