The First Reference to the Celebration of Passover Outside of the Bible
One of the Papyri, circa 419 BCE, is a letter sent from Jerusalem to Elephantine outlining Passover rituals. It is the oldest extra-Biblical text referencing Passover. "And now, this year, year 5 of King Darius, it has been sent from the king to Arsa[mes ……… …]In the month of Nisan, let there be a Passover for the Judahite garrison. Now accordingly count fourteen days of the month Nisan and keep the Passover, and from the 15th day to the 21st day of Nisan are seven days of Unleavened Bread. Be clean and take heed. Do not work…
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Passover Letter sent from Jerusalem to Elephantine, Egypt
"In the month of Nisan, let there be a Passover for the Judahite garrison. Now accordingly count fourteen days of the month Nisan and keep the Passover, and from the 15th day to the 21st day of Nisan are seven days of Unleavened Bread. Be clean and take heed. Do not work…Let this be done as King Darius (II) commanded."