Sponsorship in The Big Book.

Question: Where is the role of a sponsor described in the Big Book?

Answer: I am not sure if there is a section on that but the chapter working with others may be very helpful to you.
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The actual word sponsor or sponsorship does not appear in the First 164 pages of the Big Book.
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Some say that everything in the Big Book from page 89 (the beginning of Chapter 7 - Working With Others) through Page 164 is the "sponsor's instruction manual".

The bottom of Page 18 includes a very long sentence that describes a sponsor.