'Three' in the Bible

"Go, gather together all the Jews who are present in Shushan, and fast for me, and neither eat nor drink three days, night or day. I and my maidens will also fast the same way. Then I will go in to the king, which is against the law; and if I perish, I perish."

The Jews who were in Shushan gathered themselves together on the fourteenth day also of the month Adar, and killed three hundred men in Shushan; but they didn't lay their hand on the spoil.