Esther 3:2-5

2And all the king's servants that were in the king's gate bowed and did Haman reverence, for the king had so commanded concerning him. But Mordecai bowed not, nor did [him] reverence.

3Then the king's servants, who were in the king's gate, said to Mordecai, Why transgressest thou the king's commandment?

4And it came to pass as they spoke daily to him, and he hearkened not to them, that they informed Haman, to see whether Mordecai's matters would stand; for he had told them that he was a Jew.

5And when Haman saw that Mordecai bowed not, nor did him reverence, Haman was full of fury.