'If thou wilt forgive their sin - and if not , blot me, i pray thee, out of thy book which thou hast written'. The book being referred to her is the book of

The book being referred to in the statement is the book of life. The book of life is a term used in the Bible to describe a book in which God records the names of all those who are saved and have eternal life. It is also sometimes referred to as the Lamb's Book of Life. In the statement, the speaker is asking God to forgive the sins of a group of people and to include them in the book of life. If God chooses not to forgive them, the speaker requests that his own name be removed from the book of life as a sign of solidarity with those who are not forgiven. The statement shows the depth of the speaker's love and concern for others, and their willingness to sacrifice their own salvation for the sake of others.