Esther 3:2-5

2And all the king's servants who were at the king's gate bowed down and paid homage to Haman, for the king had so commanded concerning him. But Mordecai did not bow down or pay homage.

3Then the king's servants who were at the king's gate said to Mordecai, "Why do you transgress the king's command?"

4And when they spoke to him day after day and he would not listen to them, they told Haman, in order to see whether Mordecai's words would stand, for he had told them that he was a Jew.

5And when Haman saw that Mordecai did not bow down or pay homage to him, Haman was filled with fury.