To avoid quarrels among the first-born, as otherwise each one would try to lay the payment of redemption money upon his neighbor, Moses wrote upon twenty-two thousand slips of paper the word "Levi," and upon two hundred seventy-three the words "five shekels," all of which were then thrown into an urn and mixed. Then every first-born had to draw one of the slips. If he drew a slip with "Levi" he was not obliged to remit any payment, but if he drew "five shekels," he had to pay that sum to the priests.
Drawing Lots to Redeem the Extra Firstborn of Israel
Legends of the Jews 4:24