Esther 3:5 (KJV)

Then the king’s servants, which were in the king’s gate, said unto Mordecai, Why transgressest thou the king’s commandment?

Now it came to pass, when they spake daily unto him, and he hearkened not unto them, that they told Haman, to see whether Mordecai’s matters would stand: for he had told them that he was a Jew.

And when Haman saw that Mordecai bowed not, nor did him reverence, then was Haman full of wrath.

And he thought scorn to lay hands on Mordecai alone; for they had shewed him the people of Mordecai: wherefore Haman sought to destroy all the Jews that were throughout the whole kingdom of Ahasuerus, even the people of Mordecai.

In the first month, that is, the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month, that is, the month Adar.