I am getting married IY"H soon after Shavuos of this year, and I have started trying to prepare a dvar Torah for that time.

There is a famous idea that it was on Shavuos that Hash-m and Bnei Yisroel were married, but unfortunately, I cannot seem to find the exact source of this ma'amar Chazal. In Ta'anis 26b, the Mishna quotes a pasuk in Shir Ha'Shirim, but Rashi on the Mishna explains that the allusion to Matan Torah is, in fact, referring to Yom Kippur and the giving of the second luchos(which follows the flow of the Mishna, and fits well with the previous idea that Yom Kippur and Tu B'Av were celebratory days; the Maharsha seems to concur with this notion). Yet in his perush on Shir Ha'Shirim itself, Rashi simply cites the notion of Matan Torah as the wedding, not referring to Yom Kippur and the giving of the second luchos.

I was wondering if the Mishna was interpreting the pasuk in Shir Ha'Shirim in one of two ways: In any event, Matan Torah was like a wedding, but depending upon the context of the drash, it could be referring to the first luchos on Shavuos or the second on Yom Kippur.

Aside from that, I don't have any sources for this idea. Any help would be much appreciated.

Thank you for your help!!

Chag kasher ve'sameach, and tizku le'mitzvos!!

David Peto, Toronto, Canada