Esther 8:2

8:2 The king then removed his signet ring (the very one he had taken back from Haman) and gave it to Mordecai. And Esther designated Mordecai to be in charge of Haman’s estate.

Esther 8:10

8:10 Mordecai ¹  wrote in the name of King Ahasuerus and sealed it with the king’s signet ring. He then sent letters by couriers on horses, who rode royal horses that were very swift.

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¹ tn Heb “He”; the referent (Mordecai) has been specified in the translation for clarity.