Esther 8:5-8

(5) And said, If it please the king, and if I have found favour in his sight, and the thing seem right before the king, and I be pleasing in his eyes, let it be written to reverse the letters devised by Haman the son of Hammedatha the Agagite, which he wrote to destroy the Jews which are in all the king's provinces: (6) For how can I endure to see the evil that shall come unto my people? or how can I endure to see the destruction of my kindred? (7) Then the king Ahasuerus said unto Esther the queen and to Mordecai the Jew, Behold, I have given Esther the house of Haman, and him they have hanged upon the gallows, because he laid his hand upon the Jews. (8) Write ye also for the Jews, as it liketh you, in the king's name, and seal it with the king's ring: for the writing which is written in the king's name, and sealed with the king's ring, may no man reverse.

Though, by the very foolish law of the Medes and Persians, the king having once issued a decree, could not reverse it, yet he consented to do that which was nearly to the same purpose; what they desired concerning the salvation of the Jews. Reader! while we lament the pride and ignorance of man, who is every day liable to err, that any of his decrees should be irreversible, we cannot sufficiently admire and adore that glorious perfection of our covenant God, whose purposes in Jesus are like himself, unchangeable. Oh! the confidence the Lord's people find in this!