Hot answers tagged time
The Chamudei Daniel has the famous opinion that for things that the Shulchan Aruch says "it becomes not kosher immediately", that means "if you don't pull them out immediately." More like a 2-second rule or so.
Are there any other places in Tanach where this kind of explicit foreshadowing happens? There are probably a few, but, one memorable one for me is Shmot 16:35 that states that B'nai Yisra'el ate the manna for 40 years until they arrived at the border of Cana'an. Obviously, it hadn't yet happened. As to why such cases occur, in general, this fits into ...
The Geonim mostly lived in the Middle East, while the Rishonim mostly lived in Europe. So it seems likely that their opinions reflect different local customs. If your local custom is stricter than the established halacha, you can keep it while still recognizing the intellectual authority of those whose halachic ruling is more lenient.
Other answers have explored why the Torah mentions the future in your case, so i'm just going to bring another case of this. Bereishit 32:33: עַל-כֵּן לֹא-יֹאכְלוּ בְנֵי-יִשְׂרָאֵל אֶת-גִּיד הַנָּשֶׁה, אֲשֶׁר עַל-כַּף הַיָּרֵךְ, עַד, הַיּוֹם הַזֶּה: כִּי נָגַע בְּכַף-יֶרֶךְ יַעֲקֹב, בְּגִיד הַנָּשֶׁה. Explaining this particular case, perhaps the ...
Another one that Rashi actually points out is in Bereishis 2 14 d.h. Kush v'Ashur. As far as why here, I would suggest that it brings out the unbelievable unnatural event of the destruction, much like Eiliyahu watering everything before the heavenly fire struck.
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