10 Esther had not said what family or people she came from, for Mordecai had given her orders not to do so.
Then Mordecai sent this answer back to Esther: Do not have the idea that you in the king's house will be safe from the fate of all the Jews. If at this time you say nothing, then help and salvation will come to the Jews from some other place, but you and your father's family will come to destruction: and who is to say that you have not come to the kingdom even for such a time as this?
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Commentary on Esther 2 Matthew Henry Commentary
Chapter 2
Two things are recorded in this chapter, which were working towards the deliverance of the Jews from Haman's conspiracy:-
Est 2:1-20
How God put down one that was high and mighty from her seat we read in the chapter before, and are now to be told how he exalted one of low degree, as the virgin Mary observes in her song (Lu. 1:52) and Hannah before her, 1 Sa. 2:4-8. Vashti being humbled for her height, Esther is advanced for her humility. Observe,
Est 2:21-23
This good service which Mordecai did to the government, in discovering a plot against the life of the king, is here recorded, because the mention of it will again occur to his advantage. No step is yet taken towards Haman's design of the Jews' destruction, but several steps are taken towards God's design of their deliverance, and this for one. God now gives Mordecai an opportunity of doing the king a good turn, that he might have the fairer opportunity afterwards of doing the Jews a good turn.