10 Esther had not revealed her nationality and family background, because Mordecai had forbidden her to do so.

Read Esther 2:10 Using Other Translations

Esther had not shewed her people nor her kindred: for Mordecai had charged her that she should not shew it.
Esther had not made known her people or kindred, for Mordecai had commanded her not to make it known.
Esther had not told anyone of her nationality and family background, because Mordecai had directed her not to do so.