The greatness of the Mitzvah: The Mitzvah of separating Challah is very great. It corresponds in Gematria to all 613 Mitzvos. In merit of this Mitzvah blessing is found in one’s home and livelihood and women are protected during childbirth. In merit of this Mitzvah we were granted ability to enter Eretz Yisrael. Some are accustomed to give charity prior to separating the Challah.
 For a general summary of the order of Hafrashas Challah see Hakashrus 14/18-22; Piskeiy Teshuvos 242/11; Spice and Spirit Lubavitch cookbook p. 47-50 [The Halachas in Spice and Spirit were edited by Harav Y.K. Marlow OBM]; Hiskashrus 731
 See Hagahos Maimanis end of Hilchos Zeraim on Rambam for an overview of the greatness of this Mitzvah.
 The words “Zu Hi Mitzvas Hachallah” is Gemtraia of 613. [Hagahos Maimanis ibid]
 Shabbos 32b
 Mishneh Shabbos 31b
 Hagahos Maimanis end of Zeraim; Yalkut Shimoni Shlach 747
 Ben ish Chaiy 2 Lech Lecha 6
 Hagahos Maimanis ibid
 The acronym of the name Chana stands for Challah; Nidda and Hadlakas Neiros. In merit of her fulfilling these three Mitzvos properly she had her prayers answered and had a son Shmuel which was a prophet and leader onto Israel. Thus each woman should Daven upon separating Challah to have children that are proper and G-d fearing. [ibid]