In a Jewish bar or bat mitzvah service, the congregation’s prayer book is called a siddur.
The word siddur comes from a Hebrew root associated with order or arrangement. A siddur organizes the regular Jewish prayers used on weekdays, Shabbat, and many festivals. Its contents can include the Shema, the Amidah, blessings, psalms, and additional sections that vary according to the service and community tradition.
At a bar or bat mitzvah, the celebrant and guests may use siddurim throughout the service. The Torah reading itself comes from a sefer Torah, not from the siddur. A machzor is a separate prayer book designed especially for major festivals such as Rosh Hashanah and Yom Kippur, while a Haggadah is used for the Passover seder. Editions differ in Hebrew text, translation, commentary, page layout, and denominational practice.