One of the Aramaic papyri found in the Jewish mercenary colony of Elephantine in Egypt. The date appears on the top of the document- the 20th of Sivan, in the year 24 of Artaxerxes, King of Persia (July 6, 451 BCE). This papyrus is a contract of sale of immovable property between the Elephantine Jews—Micah and Anani.
Stern, Ephraim, Material Culture of the Land of the Bible in the Persian Period. Jerusalem- Israel Exploration Society, 1973.