Esther 3:4-6

4When they had warned him day after day and he still would not listen to them, they told Haman in order to see if Mordecai’s actions would be tolerated, since he had told them he was a Jew.

5When Haman saw that Mordecai was not bowing down or paying him homage, he was filled with rage.

6And when he learned of Mordecai’s ethnic identity, it seemed repugnant to Haman to do away with Mordecai alone. He planned to destroy all of Mordecai’s people, the Jews, throughout Ahasuerus’s kingdom.