25. When "Rosh Chodesh Teves" falls on Shabbos, three Torah scrolls should
be taken out [of the ark]. Six people are called up for reading of the
weekly portion ("Parshas HaShavua") from the first scroll. The seventh
person is called up for the reading of the Rosh Chodesh passage from the
second scroll; we begin the Rosh Chodesh passage from the words, "Uv'yom
haShabbos" (see Chapter 78:1, and Chapter 79:1). The half-kaddish is then
recited, and the "Maftir," which consists of the Chanukah reading
appropriate to that day (1), is read from the third scroll.
"Roni v'simchi" is recited as the Haftorah. Although, in general, we follow
the principle that the more frequently occurring mitzvah takes precedence
("Todir Ve'She'Eino Todir, Todir Kodem"), [and therefore, we should be
reading the Rosh Chodesh Haftorah rather than the Chanukah Haftorah], that
rule is applied [only] to the reading from the Torah scroll, from which we
read both [the portion of Rosh Chodesh and that of Chanukah]. However, only
one Haftorah is recited, and therefore, the Chanukah Haftorah supersedes
that of Rosh Chodesh, because [it serves to] publicize the Chanukah miracles.