To confirm these days of Purim in their times appointed, according as Mordecai the Jew and Esther the queen had enjoined them, and as they had decreed for themselves and for their descendants, concerning the matters of the fastings and their lamentations.
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George Leo Haydock
Fasts and cries. See ver. 21. (Calmet)
Protestants, "the matters of their fastings and their cry: and the decree of Esther confirmed these matters of Purim, and it was written in the book. "(Haydock)
This feast, instituted by Mardochai, was accepted and observed by the Jews as a constitution agreeable to, and not contrary to, the law, Deuteronomy iv. 2., and xii. 32. (Worthington)