Mase surprised everyone yesterday when he unloaded on Cam'ron in the 20-plus years in the making diss track 'The Oracle."

He opened the book on Cam: accusing him everything from snitching to incest. 

Cam quickly acknowledge the diss, and quickly picked up his pen and started crafting a response. 

He dropped a preview of that on his IG page last night.

@myfabolouslife we gonna play this at ya party 2nite. I herd he coming👀we'll be there!! Song #BlackFriday #TheProgram2 January 1. Hiiiii Betha 😘 Austin TX 2mr #TheProgramTour @officialheatmakerz

A post shared by @mr_camron on Nov 24, 2017 at 6:21pm PST

“I ain't gotta a sister, the only sister I fucked was yours” Cam'ron raps, and then suggests one of the teachers from their old Harlem neighborhood molested Mase. “Do what you must do, Me I'm getting my just due/ but who you talking tough too?," he continues. "Blinky just snuffed you, Puff [Daddy] fucked you."

Mase hasn't said anything about the comeback yet. But his sister has.

@rsvpmase’s sister said @mr_camron lying about sleeping with her lol... See previous post

A post shared by FAMEOLOUS (@fameolousig) on Nov 24, 2017 at 7:29pm PST