Rabbi Chaim Naeh was a prominent rabbinic authority and Chassidic scholar, known for his expertise in Jewish law and his influential works on halachic measurements and practice. He is addressed in the correspondence as a respected rabbi and father to Rabbi Moshe Tzvi, whose marriage is the subject of the letter.
The Lubavitcher Rebbe's letter to Rabbi Chaim Naeh, dated 25 Shevat 5712 (1952), is written in a tone of warmth and respect. The Rebbe acknowledges receipt of Rabbi Naeh's letter, which included news of his son Rabbi Moshe Tzvi's marriage. The Rebbe extends heartfelt blessings—"mazal tov, mazal tov"—wishing that the marriage take place at an auspicious and successful time, and that the young couple build a home in Israel founded on Torah and mitzvos as illuminated by Chassidus. The Rebbe also expresses a hope that Rabbi Naeh will merit to see much nachas, specifically "Jewish nachas, chassidic nachas," from his son and family.
In a postscript, the Rebbe shares a brief but profound halachic and Chassidic insight related to the nature of witnesses in Jewish law, particularly in the context of marriage (kiddushin). The Rebbe distinguishes between two types of witnesses: those whose role is merely to clarify facts, and those whose testimony is essential to the creation of a new legal reality, as is the case with marriage. He draws a parallel to the verse "You are My witnesses" (Yeshayahu 43:10), explaining that witnesses can either testify about a matter or be integral to its very existence. The Rebbe further connects this concept to the spiritual idea of becoming a partner with the Holy One, blessed be He, in creation, especially through service that transcends personal understanding. This teaching is supported by references to classic rabbinic sources and Chassidic thought.