Calling someone to say the Torah blessings during a service is called an Aliyah (from the Hebrew: ????????, from the verb la'alot, ?????, meaning, "to rise, to ascend; to go up"). The widespread practice is that on the Shabbat one or more days after his 13th birthday, a boy may recite the blessings for the Torah reading. He may also read the week's portion from the Torah (five books of Moses) and Haftara (selections from the books of the Prophets), give a d'var Torah which may include a discussion of that week's Torah portion, or both. He may also lead part or all of the morning prayer services. Precisely what the Bar Mitzvah should lead during the service varies from one congregation to another and is not fixed by Jewish law. Sometimes the celebration is during another service that includes reading from the Torah, such as a Monday or Thursday morning service, a Shabbat afternoon service, or a morning service on Rosh Chodesh, the New Moon.