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After the morning bracha on the torah, we say "אלו דברים שאין להם שיעור". The source for this text is a combination of the first mishna of Peah, and some additions from the bottom of Shabbat 127a.
I recently noticed that in Nusach Ari, there's a further addition made:
והבאת שלום בין אדם לחברו ובין איש לאשתו
I was wondering if anyone knows the original source for adding these words, or if there is any rabbinic authority on why it was deemed necessary to add them.
There is a book called שער הכולל that aims to explain the choices made in that version of the siddur. The author notes the following in regard to the phrase ובין איש לאשתו (chapter 1, paragraph 19):
במשנה שלפנינו לא נמצאו התיבת הללו אבל בסדר היום ובשער השמים משל״ה מביאים הלשון הזה גם בתד״א פי״ג לענין אהרן הכהן מביא זה הלשון בין אדם לחבירו ובין איש לאשתו
In the text of the Mishnah as we have it, these words are not found. However, in Seder HaYom and in Sha'ar HaShamayim by the Shla"h these words are included. Also, in Tana Devei Eliyahu, chapter 13, regarding Aaron the priest, this wording is used.
The extant manuscripts do not have that addition (see here footnote 8) however, there are many variations on this saying. It is apparently very common to have that addition in Edut HaMizrachi Nusachos, in addition to Nusach Sfard and Nusach Ari.
The Arizal ascribes a specific Kabbalistic meaning to the two parts.
