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Ayvo [the father of Rav]: I was standing in front of Rabbi Elazar bar Tzadok and someone brought him an aravah, he shook it but didn’t make a bracha.

 Summary 

 Rav Yehuda quoting Shmuel: A bracha is recited on the mitzvah of lulav all seven days. On the mitzvah of sukkah, only one day.

Since the mitzvah of lulav is renewed each morning, every day is a new bracha. But since the mitzvah of sukkah applies at night as well, all seven days are like one long day.

 Rabbah bar bar Chana quoting Rabbi Yochanan: A bracha is recited on the mitzvah of sukkah all seven days. On the mitzvah of lulav, only one day.

This is because sukkah is a d’oraysa all seven days while lulav is d’rabbanan. 

When Ravin came, he quoted Rabbi Yochanan: A bracha is recited on both mitzvos all seven days*.

 Rav Yosef: Take the opinion of Rabbah bar bar Chana, because all amoraim [including Ravin. Also Rav Dimi. Rabeinu Chananel] agree with his opinion with regard to sukkah. [What Rav Yosef is saying exactly is not clear, but in practice we follow Ravin]. 

 Challenge: Beraisa: One who makes a lulav for his use recites a shehechyanu (we don’t do this because we rely on the blessing during kiddush). When he takes it on Yom Tov, he recites al netilas lulav. He recites this bracha every day.

One who builds a sukkah for his use recites a shehechyanu. When he enters it on Yom Tov, he recites leisheiv basukkah. This bracha is only said on the first day.

This contradicts the opinion of Rabbah bar bar Chana both in regard to lulav and sukkah. 

 Lulav can be explained because it was d’orayso in the times of the Beis Hamikdash. But the difficulty with regard to sukkah remains.

 Resolution: This is a matter that is disputed by tannaim, as we see in the beraisa: 

 Rebbi: A bracha is recited each time one dons tefillin. 

 Chachomim: One only recites the bracha in the morning.

[According to Rebbi the “doing” of the mitzvah is important. According to the Chachomim the “availability” of the mitzvah is what matters. These svaros can be applied to the machlokes regarding sukkah and lulav].

 Click here to listen to the shiur with Tosfos https://drive.google.com/file/d/193rJ2vebIwOvYKERoUNqwJki2iHbOCXE/view?usp=sharing

* Tosfos: But on sukkah it may be recited multiple times per day, this is because it is impossible to eat without entering a sukkah so each time one desires to eat, one makes a new bracha.