Chapter 141:17
Laws of the Megillah
17. On Shabbos (which is not Purim (1)) it is permissible to handle a
Megillah scroll (2). However, if Purim is occurring on a Sunday, one should
not bring the Megillah to synagogue on Shabbos (that is, the day before
Purim), even in a city which has an "Eiruv" (3), because it would be
considered [a violation of the prohibition of] preparing on Shabbos for a
weekday.
FOOTNOTES:
(1) Purim never occurs on Shabbos.
(2) That is, it is not "Muktzah."
(3) An "Eiruv" is an enclosure consisting of a series of poles or the like,
with wire or string pulled tight over the top of them. It turns the area
enclosed by it (sometimes even a number of neighborhoods), into a private
domain ("Reshus HaYochid"), thereby permitting carrying within it on
Shabbos.