Charles Buck Theological Dictionary
About the year B. C. 277, the Old Testament was translated into Greek, by the united labours of about seventy learned Jews, and that translation has been since known by the version of the LXX.
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Buck, Charles. Entry for 'Seventy'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/s/seventy.html. 1802.