Esther 3:2

3:2 As a result, all the king’s servants who were at the king’s gate were bowing and paying homage to Haman, for the king had so commanded. However, Mordecai did not bow, nor did he pay him homage.

Esther 3:5

3:5 When Haman saw that Mordecai was not bowing or paying homage to him, he was filled with rage.