siyum sometimes refers to the celebratory meal itself. Common occasions An enduring custom is for the community to complete a unit of Torah or tractate(s) of Talmud during the 30 days following the death of a beloved one and hold a communal siyum thereafter, in tribute and honor of the memory of the deceased (see also Bereavement in Judaism). It has become customary for synagogues to arrange a siyuum (rarely written with two u's) on the morning before Passover to allow those fasting for Ta’anit Bechorim (Fast of the Firstborn) to break their fast, taking advantage of the halakhic principle that prioritizes Torah study. A siyum ha-sefer, meaning “completion of the book,” is also held as a ceremonial completion and dedication of a sefer Torah, a handwritten copy of the Torah, the most important Jewish ritual object, which is kept in the Ark of a synagogue. This is not technically related to the other forms of siyum. Usually, when an individual or a group conclude the study of any tractate of the Talmud, or even of a seder of Mishnah (less commonly, of a single tractate of Mishnah), a siyum is celebrated. At the end of every volume of the Talmud a special hadran prayer is printed with a set order of prayers and a special kaddish, Kaddish D'itchadita, in honor of the completion of that volume, which Judaism considers to be an important achievement and a milestone worth celebrating. In the merit and honor of a deceased individual, it is customary to undertake Mishnah study with the goal of holding a siyum. The entirety of the Mishnah is divided among many family members or volunteers, to be completed at shloshim or at yahrtzeit. (Sometimes, a single seder is completed for shloshim, which may also contribute simultaneously to the completion of all six for the yahrtzeit.) Rabbi Moshe Feinstein (based on the Nemukei Yosef, the Ran, the Rashbam, and the Eliyah Rabbah) extends the concept of a siyum to include even a festive meal celebrating the completion of any mitzvah (commandment) that has taken a significant duration of time (such as a number of weeks or months). In contrast, Rabbi Osher Weiss suggested that a siyum could be done upon finishing in-depth study of a Biblical book or of a book "from the core of the Oral Torah" such as Mishnah and Gemara, but not upon finishing later works which