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One of Diddy 's close friends is speaking out about the terrifying moment the mogul woke up in prison with a knife pressed to his throat.

Charlucci Finney says the attack went down during one of the nights Diddy was sleeping at MDC Brooklyn -- an incident that first came to light during Diddy's sentencing. Sources familiar with the situation have confirmed its authenticity to us. Getty

Finney told Daily Mail , his friend woke up with the weapon to his neck ... just seconds away from serious harm, or death.

He says he doesn't know if the guards came to break it up or if Diddy fought the guy off. Sources familiar with the situation confirmed the details for TMZ.

Finney imagines the inmate's intent was to intimidate Diddy, particularly in a notorious facility like MDC B

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