The iconic star died on July 22, aged 76, and his upcoming autobiography will explore the ups and downs of his life, including the cheating scandal that almost ended his marriage in 2016.
"This book was basically Ozzy's last confessions and contains a lot of passages about how he is sorry for the affair," a source told Britain's The Sun on Sunday newspaper.
"As he was always brutally honest during his life, it's been decided not a word will be changed, even about painful times in his life and how his affair affected Sharon."
The 72-year-old TV star - who married Osbourne in 1982 - is expected to write a foreword to the book, which is titled Last Rites.
"Sharon is made of stern stuff and the publishers know she will want to leave her fingerprint on this book. Writing its foreword will also be cathartic for her and act as a way of laying Ozzy to rest," the source said.
The autobiography is set to be published in October. The blurb reads: "Last Rites is the shocking, bitterly hilarious, never-before-told story of Ozzy's descent into hell.
"Along the way, he reflects on his extraordinary life and career, including his marriage to wife Sharon, alongside his reflections on what it took for him to get back onstage for the triumphant Back to the Beginning concert, streamed around the world, where Ozzy reunited with his Black Sabbath bandmates for the final time.
"Unflinching, brutally honest, but surprisingly life-affirming, Last Rites demonstrates once again why Ozzy has transcended his status as 'The Godfather of Metal' and 'The Prince of Darkness' to become a modern-day folk hero and national treasure."
Osbourne's death was announced by his family, who revealed he was "surrounded by love" when he died.
"It is with more sadness than mere words can convey that we have to report that our beloved Ozzy Osbourne has passed away this morning. He was with his family and surrounded by love," their statement said.
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