Is it possible to say that the Jews were in Egypt for only 210 years because they were worked so hard? Would Hashem really do that if he already told Avraham that they would be there for 400 years?
2 Answers
Absolutely. That is indeed one of the well-known answers as to how to reconcile these two facts. (I don't recall the original source for this, but an example is here.)
This didn't contradict Hashem's original promise to Avraham, because the wording of that promise was deliberately left ambiguous. The verse (Gen. 15:13) states:
.יָדֹעַ תֵּדַע כִּי גֵר יִהְיֶה זַרְעֲךָ בְּאֶרֶץ לֹא לָהֶם, וַעֲבָדוּם וְעִנּוּ אֹתָם, אַרְבַּע מֵאוֹת, שָׁנָה
"You shall certainly know that your descendants will be aliens in a land not theirs, and they will enslave them and afflict them, four hundred years."
The last clause, "four hundred years," may refer to its immediate antecedent ("they shall enslave and afflict them"), or to the previous one ("your descendants shall be aliens in a land not theirs"). Hashem could have allowed the first meaning to be the correct one, and in that case the Egyptian exile would indeed have lasted a full four centuries; but instead He kindly moved it up so that the Exodus occurred after only 210 years. At that point it was understood in retrospect that Avraham's descendants (beginning with Yitzchak, who was born 400 years earlier) had indeed been "aliens in a land not theirs" (first Canaan, then Charan, then Canaan again, and finally Egypt) for all that time, and that Hashem's promise was fulfilled in that way.
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We start counting from Avrham because he was in an בְּאֶרֶץ לֹא לָהֶם Apr 12, 2010 at 4:12
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1The 430 years mentioned in Ex. 12:40 begins with Avraham (specifically, with the Covenant Between the Parts), yes. But the 400 years specifically refers to זרעך, "your descendants" - and Avraham didn't have any of those at that time.– AlexApr 12, 2010 at 15:45
The Vilna Ga'on notes the cantillation notes of וימררו את חייהם, they embittered their lives (Shemos 1:14) is קדמא ואזלא, which means preceded and went, and the numerical value of קדמא ואזלא is 190 (the difference between 400 and 210), because the Egyptians embittered their lives in such a way that they stuffed 190 years worth more of work into those 210 years, and therefore the Jews "preceded and went." So the 400 years were carried out, just they were stuffed into 210 years.