Esther 3:1, 5, 6

After these events, King Xerxes honored Haman son of Hammedatha, the Agagite, elevating him and giving him a seat of honor higher than that of all the other nobles.

When Haman saw that Mordecai would not kneel down or pay him honor, he was enraged.

Yet having learned who Mordecai’s people were, he scorned the idea of killing only Mordecai. Instead Haman looked for a way to destroy all Mordecai’s people, the Jews, throughout the whole kingdom of Xerxes.