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Jews living outside the land of Israel are supposed to delay their Passover for one month. So when Jews living outside Israel eat their dinner the same time as those living in Israel. they breach the covenant that Yhvh's people agreed upon with God in the Old Testament.

Num 9:10-12a . . Speak to the children of Israel saying, Any person who becomes unclean from [contact with] the dead, or is on a distant journey, whether among you or in future generations, he shall make a Passover sacrifice for the Lord.

. . . In the second month, on the fourteenth day, in the afternoon, they shall make it; they shall eat it with unleavened cakes and bitter herbs.

. . .They shall not leave over anything from it until the next morning, and they shall not break any of its bones.

Note that even when Jews are out of the land during Passover, they still have to slay and roast with fire an entire lamb for their dinner. Failure to do so constitutes a very grave sin.

Num 9:12b . .They shall make it in accordance with all the statutes connected with the Passover sacrifice.

Deut 27:26 . . Cursed be he who does not uphold the words of this Torah, to fulfill them.

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