Clarke's Bible Commentary - Esther 8:2
Verse 2. The king took off his ring] In the ring was the seal of the king. Giving the ring to Mordecai was tantamount to giving him the seal of the kingdom, and constituting him the same as lord chancellor among us.
John Gill's Bible Commentary
Ver. 2. And the king took off his ring, which he had taken from Haman, and gave it unto Mordecai , etc.] which, with the Persians, was a token of the strongest affection and strictest friendship f163 ; the Targum calls it his signatory ring, that with which he signed laws, edicts, letters, patents, etc. and so hereby made him keeper of the seals: and Esther set Mordecai over the house of Haman ; appointed him her steward of the estate of Haman, the king had given her.
Matthew Henry Commentary
Verses 1, 2 - What Haman would have done mischief with, Esther will do good with. All the trust the king had reposed in Haman, he now placed in Mordecai: happy change. See the vanity of laying up treasure upon earth; he tha heapeth up riches, knoweth not who shall gather them. With what littl pleasure, nay, with what constant vexation, would Haman have looke upon his estate, if he could have foreseen that Mordecai, the man he hated above all men in the world, should have rule over all tha wherein he had laboured! It is our interest to make sure of thos riches which will not be left behind, but which will go with us to another world.
Original Hebrew
ויסר 5493 המלך 4428 את 853 טבעתו 2885 אשׁר 834 העביר 5674 מהמן 2001 ויתנה 5414 למרדכי 4782 ותשׂם 7760 אסתר 635 את 853 מרדכי 4782 על 5921 בית 1004 המן׃ 2001