The lulav seven days — and the new grain
Also in Rosh Hashanah 4:3
The Omer permits the new grain
Brought on 16 Nissan
The lulav: seven days — where?
While the Beis HaMikdash stoodIn the Mikdash, seven days; in the medinah, one day→ seven in the Mikdash, one elsewhere
Rambam: Yerushalayim counts as Mikdash
After the Churban — Rabban Yochanan ben ZakkaiEverywhere, seven days→ seven everywhere — in memory of the Mikdash
The whole day of waving — forbidden
Rabban Yochanan ben ZakkaiThe entire day is forbidden for the new grain→ eat the new grain only from the next day
Lest, once rebuilt, they eat before the Omer
Or: to show it can be permitted at all
Sukkah 3:12
The Takanos for the Lulav and Yom HaNef
תַּקָּנוֹת הַלּוּלָב וְיוֹם הָנֵף
בָּרִאשׁוֹנָה הָיָה הַלּוּלָב נִטָּל בַּמִּקְדָּשׁ שִׁבְעָה,
וּבַמְּדִינָה יוֹם אֶחָד.
מִשֶּׁחָרַב בֵּית הַמִּקְדָּשׁ,
הִתְקִין רַבָּן יוֹחָנָן בֶּן זַכַּאי
שֶׁיְהֵא לוּלָב נִטָּל בַּמְּדִינָה שִׁבְעָה זֵכֶר לַמִּקְדָּשׁ,
וְשֶׁיְּהֵא יוֹם הָנֵף כֻּלּוֹ אָסוּר.