'Three' in the Bible

"Go, assemble all the Jews who are found in Susa and fast in my behalf. Don't eat and don't drink for three days, night or day. My female attendants and I will also fast in the same way. Afterward I will go to the king, even though it violates the law. If I perish, I perish!"

The Jews who were in Susa then assembled on the fourteenth day of the month of Adar, and they killed three hundred men in Susa. But they did not confiscate their property.