21 During the time Mordecai was sitting at the king's gate, Bigthana[1] and Teresh, two of the king's officers who guarded the doorway, became angry and conspired to assassinate King Xerxes. 22 But Mordecai found out about the plot and told Queen Esther, who in turn reported it to the king, giving credit to Mordecai. 23 And when the report was investigated and found to be true, the two officials were impaled on poles. All this was recorded in the book of the annals in the presence of the king.

Matthew Henry's Commentary on Esther 2:21-23

Commentary on Esther 2:21-23

(Read Esther 2:21-23)

Good subjects must not conceal any bad design they know of against the prince, or the public peace. Mordecai was not rewarded at the time, but a remembrance was written. Thus, with respect to those who serve Christ, though their recompence is not till the resurrection of the just, yet an account is kept of their work of faith and labour of love, which God is not unrighteous to forget. The servant of God must be faithful to every trust, and watchful for those who employ him. If he appear to be neglected now, he will be remembered hereafter. None of our actions can be forgotten; even our most secret thoughts are written in lasting registers, Revelation 20:12.