Amidah

The Amidah also called the Shmone Esre is the central prayer of the Jewish liturgy. As Judaism's prayer par excellence, the Amidah is often designated simply as tfila in Rabbinic literature.Observant Jews recite the Amidah at each of three prayer services in a typical weekday morning, afternoon, and evening. A special abbreviated Amidah is also the core of the Mussaf service that is recited on Shabbat Rosh Chodesh, and Jewish festivals, after the morning Torah reading, with various forms of the Amidah that depend on the occasion. The typical weekday Amidah actually consists of nineteen blessings, though it originally had eighteen when the Amidah is modified for specific prayers or occasions, the first three blessings and the last three remain constant, framing the Amidah used in each service, while the middle thirteen blessings are replaced by blessings specific to the occasion