Why is the book of Leviticus called the book of atonement?

Answer 1

The short answer is: The Levites were a special group of Hebrews set aside by God as Priests for the performance of ceremonial cleansing, offerings, and sacrifices, for the Hebrew people (Israelites). The Book of Leviticus is called the Book of Atonement because it contains very specific instructions to the Priests (Levites) for the carrying out of all the aforementioned duties, as well as specific instruction for the carrying out of the yearly Day of Atonement by the selected High Priest from among the Levites. One person who met God's requirements was selected High Priest for that year, and had the sole responsibility of the offering of the once a year sacrifice of a "lamb without blemish" to God as the atoning sacrifice for all of the Hebrew people within the "Holiest of Holies", the most sacred part of the Temple, wherein only the High Priest was allowed.