Ptolemy, the king (of Egypt), assembled seventy-two elders of Israel and lodged them in seventy-two separate chambers, but did not tell them why he did so. Then he visited. each one in turn and said, "Write out for me the law of Moses your Rabbi." The Holy One--blessed be He!--went and counseled the minds of everyone of them, so that they all agreed, and wrote, "God created in the beginning," etc.
Meggillah, fol. 9, col. 1.