Esther 9:24

because Haman the son of Hammedatha, the Agagite, the enemy of all the Jews, had plotted against the Jews to destroy them, and had cast Pur, that is the lot, to consume them, and to destroy them;

Esther 3:5-13

And when Haman saw that Mordecai bowed not down, nor did him reverence, then was Haman full of wrath.

Esther 9:10

the ten sons of Haman the son of Hammedatha, the Jew's enemy, slew they; but on the spoil they laid not their hand.

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Summary

Because Haman the son of Hammedatha, the Agagite, the enemy of all the Jews, had devised against the Jews to destroy them, and had cast Pur, that is, the lot, to consume them, and to destroy them;

Bible References

The enemy

Esther 9:10
the ten sons of Haman the son of Hammedatha, the Jew's enemy, slew they; but on the spoil they laid not their hand.
Esther 3:5
And when Haman saw that Mordecai bowed not down, nor did him reverence, then was Haman full of wrath.

Pur

Esther 3:7
In the first month, which is the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month , which is the month Adar.

American Standard Version Public Domain