The Standard Prayer Book is a Jewish prayer book, or Siddur, containing prayers, meditations, and texts used during life passage ceremonies including circumcision, marriage and funerals, with variants for Jewish holy days. It includes texts such as the Ten Commandments, the Maimonidean 13 Principles of Faith, and the Pirqe Aboth (Ethics of the Fathers). This Siddur, The Standard Prayer Book, appears to have been widely used in the early 20th century.