This letter was addressed to R. Yaakov Landau, the Rav of Bnei Brak and a leading Lubavitch Rabbinic authority.

B”H, 4 Cheshvan, 5710

Greetings and blessings,

Certainly, my letter from before Rosh HaShanah duly arrived. I am writing about a matter of present concern.

In another city, there are [chassidim] working to make a mikveh from rainwater and they asked if there are any issues or particulars that the members of the chassidic brotherhood are careful to adhere to or are particularly fastidious to observe. I know that you were one of those who was involved in such activities in Rostov.1 Undoubtedly you heard several points and instructions from the Rebbe [Rashab].

I would be very grateful if you could write to me with as many details as possible. For the matter to be complete, it would be desirable to include the reasons for the directives, if they are known.2

It is unnecessary to state that this request applies to other instructions in matters applying to the laws of the sections of Orach Chayim and Yoreh Deah of the Shulchan Aruch that you received [from the Rebbe Rashab]. Nevertheless, the matters that apply to the mikveh are pressing, as mentioned above.

With thanks offered in advance and wishes for a complete recovery and everlasting good in all matters,

M. Schneerson