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The three day fast that Esther and Mordecai and the Jew's of Shushan observed during Nissan fell out on (at least) the first day of Passover. I remember hearing an explanation from Rabbi Jonathan Eybeschutz on how could Jews fast on Passover, when it is a mitzva to eat and drink, (matza, four cups of wine, among other things).

Does anyone know the explanation and the source for it?

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For background source material, see Esther (4:16 in light of 3:12); M'gilla (15a,ויעבור מרדכי אמר רב שהעביר יום ראשון של פסח בתענית); Esther Rabba (8:7, וצומו עלי... שלשת ימים אלו הן י"ג וי"ד וט"ו בניסן, שלח לה והרי בהם יום ראשון של פסח...); Yalkut Shim'oni (§1056, ענה מרדכי ואמר לאסתר איני יכול לבטל...). The discussion you are looking for is in Ya'aros D'vash (2:2). – Fred May 21 '14 at 18:31
If anywhere the Yaaros Dvash,I will try to look it up – sam May 21 '14 at 18:46
@sam It is. See the end of my above comment. – Fred May 21 '14 at 18:53
Does it mention that the Jews ate a kezayis matzah? – Efraim May 21 '14 at 18:58

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