Some Insight Into Why The Mitzvah of Succah Is the Only Mitzvah that We Say A Special יהי רצון For When Finishing

[Whilst we are discussing the mitzvah of simcha, it's interesting to note that the pasuk says, ושמחת בחגך והיית אך שמח, the meforshim ask that אך normally comes to exclude something. The question is, what is it excluding over here, why can't one be happy without any exclusions?

The Medrash Agadah Buvar )בובר( on Parshas Reʼeh answers: אין בעולם הזה שמחה שלימה שבניו מצערין אותו על השלחן – “In this world there is no complete simcha, as one's children cause pain and aggravation at the table.”]

Some Insight Into Why The Mitzvah of Succah Is the Only Mitzvah that We Say A Special יהי רצון For When Finishing

It is a minhag Yisrael that when the mitzvah of succah has been completed, we don't simply stop sitting in the succah; we actually say goodbye to the succah, offering a tefillah that has been codified by the Rema. כשם שקימתי וישבתי בסוכה זו כן יהי רצון... "may it be your will that just as I have fulfilled [the mitzvah] and dwelled in this succah, so may I merit in the coming year to dwell in the succah of the skin of the Livyason."

The question is, why do we have to say goodbye to the succah? When we finish blowng shofar on Rosh Hashanah, we don't say goodbye to the shofar; we just put it away until next year. Likewise, when Succos is over, we don't take leave of the lulav and esrog.

Says R' Hutner (Pachad Yitzchak 119), in the times of the Beis HaMikdosh, there was a mitzvah of linah, that is, sleeping in Yerushalayim after the Shalash Regalim, taking leave of the Beis HaMikdash as it were, to show that we find it difficult to part with. Likewise, since the succah is a microcosm of the Beis HaMikdash, we have the custom of not simply exiting the succah but we take leave of it and we daven that it be the will of Hashem that we will sit in the shade of the Livyason.

In the zechus of sitting in the microcosm of the Beis HaMikdash for the past seven (or eight in Chutz Laʼaretz) days, may we merit to sit in the real Beis HaMikdash speedily in our days.