§1
During the entire month of
Nisan we do not say
Tachanun or
Tzidduk Hadin (burial service), and we do not say
Tzidkasecha on Shabbos at
Minchah. It is customary from
Rosh Chodesh on, to read (from the
Seifer Torah) the
parashah of the
Nasi who brought his offering on that day. On the thirteenth day of the month, we read in
parashas Beha'alosechah until
"Kein asah es hamenorah" "So did he make the Menorah" which is fitting for the tribe of Levi.
§2
[During the month of
Nisan,] we do not fast even the fast of a
Yahrzeit, but we may fast because of a dream. The firstborn (males) fast on
erev Pesach, as will be explained, God willing, in Chapter 113. A groom and a bride also fast during
Nisan, even on
Rosh Chodesh Nisan.
§3
On
Shabbos Hagadol at
Minchah it is customary not to recite
Barchi Nafshi, but to say instead
Avadim Hayinu etc., because on
Shabbos Hagadol the redemption from Egypt and the miracles began.