John Gill Commentary Esther 4:17

"So Mordecai went his way, and did according to all that Esther had commanded him." — Esther 4:17 (ASV)

So Mordecai went his way
About the business he was directed to; the word used sometimes signifies passing over or transgressing, Jarchi interprets it of Mordecai's transgressing the command, by fasting on a festival; the letter being written on the thirteenth of Nisan, (Esther 3:12) , the next day was the passover, on which he supposes the fast began; and the three days were, the fourteenth, fifteenth, and sixteenth of the month, and belonged to the feast of the passover and of unleavened bread; so the Targum:

and did according to all that Esther had commanded him ;
got the Jews together, and kept a fast three days; according to the Midrash ^F5 they were the thirteenth, fourteenth, and fifteenth of Nisan.

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FOOTNOTES:

• F5: Midrash Esther, fol. 94. 4.