רבקה את בקחתו שנה ארבעים בן יצחק ויהי הארמי לבן אחות ארם מפדן הארמי בתואל בת כה) “אשתו לנכח ‘לה יצחק ויעתר :לאשה לו (כא-כ
Harav Avigdor Tzarfati, one of the Baalei Hatosafos, wrote: The juxtaposition of the pesukim “bekachto es Rivka” and “Vaye’etar Yitzchak” teaches us that Yitzchak prayed copiously on the day of his wedding, and from here we learn that it is fitting for a chassan to fast and daven on the day of his chuppah.
Harav Shimon Sofer, the Rav of Krakow, would say in the name of his father, the Chasam Sofer, that a chassan on the day of his chuppah has the power like the tzaddik hador, and his tefillah is heard.
The Trisker Maggid explained that this is what Chazal referred to (Pirkei D’Rabi Eliezer Ch. 16) with the words “chassan domeh lemelech.” The word “דומה” in Aramaic is from the term of dibbur (see Rashi Sotah 27a ad loc. duma), and when they say “chassan domeh l’melech,” they allude “that the chassan has the power to speak before the King, meaning the King of kings HaKadosh Baruch Hu, to effect a yeshuah for one who needs a yeshuah.”
Peirushim Upeskuim Al HaTorah LeRabbeinu Avigdor Tzarfati; Shu”t Siach Yitzchak 497 Ch. 6; Chamudei Tzvi Yisro
