Siddur Lev Chadash is a Hebrew term that refers to a modern prayer book used by the Jewish community. It includes prayers and liturgical readings for daily and holiday services. There are various synonyms to refer to this prayer book. For instance, it can be called the "New Heart Prayer Book," "Revised Prayer Book," or "Contemporary Prayer Book." Each of these synonyms indicates that the Siddur Lev Chadash is a modern-day version of an ancient prayer book and includes updated liturgy and interpretations of prayers. Compatible with the modern Jewish lifestyle, Siddur Lev Chadash is an essential component of Jewish worship today.