In his introduction to chapter Chelek, Maimonides stated thirteen principles of faith (or fundments of religion).
The third principle is to exclude any materiality or similarity to materiality from our idea of G-d. We must refute material like atributes for him. For instance, He has no movement or arrest, localisation. Those are not concerning him not essentially, nor accidentally.
Rambam showed that this principle was stated by the wises in Talmud. The text quoted is in Masechet Chagiga 15a. According to Rambam lecture, Talmud states that G-d is not "linked to something else or separated from something else".
The text is the following:
לא ישיבה ולא תחרות ולא עורף ולא עיפוי
no neck and no contact.
The problem is that the statement end is:
שמא חס ושלום שתי רשויות הן?
Don't we conclude from this that there is two powers Chas Veshalom!?
This is precisely the statement pronounced by Acher (Elisha Ben Abuya when he became confused in his faith.
So this conclusion need to be wrong. How can the Rambam read it as a true statement?