The American dealt a chilling promise to the WBA, WBC and Ring Magazine middleweight champion ahead of their world title unification in Las Vegas.
The pair almost came to blows at their weigh-in on Friday night, as they went nose-to-nose before a shove from Alvarez.
Both stars looked animated, and had to be held apart by their respective trainers.
Speaking to DAZN after the weigh-in concluded, the IBF champion had a strong message for Alvarez.
“This is the opportunity of a lifetime,” he told AK & Barak.
“I feel like I’m the best middleweight in the world, and that motherf****r is going to get it tomorrow. Watch that s**t.
“Let’s do this Saturday night. Period. All this weigh-in, bumping me with that big-a** head, it’s time to put up.
“I’m going to talk with my fists tomorrow.”
Jacobs played down his involvement in the scuffle, and simply put it down to the magnitude of the fight.
“Emotions are running high,” he continued. “And I’ve never backed away from a challenge in my life.
“I’m from Brownsville, I’m never waining and I never will.”
He was joined on stage by his son, Nate, and explained that he will have the added incentive of having him by his side tomorrow.
He said: ”Everything I do is for him, everything I do is for my family, for Brooklyn, for the culture.
“We’re about to put on for the city, bet that.”
Alvarez refuted Jacobs’ claims, and insisted that it was the challenger who was at fault for the scuffle.
“I see fear, and that was fear what he did there,” he said through a translator.
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