In the first month, which is the month of Nisan, in the twelfth year of King Ahasuerus, they cast Pur (that is, the lot), before Haman to determine the day and the month, until it fell on the twelfth month, which is the month of Adar. Esther 3:7

Esther’s cousin, Mordecai, refused to bow to the new prime minister of the kingdom, Haman. This infuriated him and when Haman discovered Mordecai is Jewish, he is determined to rid the kingdom of all Jews and he talks the king into agreeing to the plot.
Remember that it is unknown that Queen Esther is also Jewish.

The casting a lot (pur) determines the date for the annihilation of the Jews to begin begins as the twelfth month and gives a name to the holiday the Jews create (Purim).

As I said before, God is not mentioned in the Book of Esther, yet you see His providential care for His people throughout the book.

The enemies of God cast a lot against the believers in God – always plotting to get rid of the people of God. I believe their thinking is to remove God from society by removing those that worship and promote Him.
However, laws, imprisonment, and death do not deter the belief in and the worship of God.
Persecution only strengthens believers.