Verses with the word authority in the Old Testament (2 verses):
Esther 9:29
Then Esther the queen, the daughter of Abihail, and Mordecai the Jew, wrote with all authority, to confirm this second letter of Purim.
Proverbs 29:2
When the righteous are in authority, the people rejoice: but when the wicked beareth rule, the people mourn.
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