The author of the book of Esther notes the extent of Xerxes's Persian Empire, from India to Africa, and his elaborate banquet, which many scholars believe was held for the purpose of planning his invasion of Greece.

This statement is true and is quoted in the book "The essence of the Old testament - A survey". Esther was the divine instrument planted into Xerxes's persian empire who hide her Jewish identity and became a Queen by dismissal of Vashti, the former queen.

Explanation:

Esther disobeyed God's commands by entering into Xerxes harem and became a queen of the Persian empire despite of the anti-Jewish prejudice. She hid her identity and became a part of the divine plan unknowingly which then resulted into invasion of Greece by Xerxes as believed by many scholars.