Death Threat For Justin Bieber Ex

A judge in L.A. County Superior Court issued the temporary order on Tuesday, requiring Steven Cintron to stay 100 yards away from Jasmine and her family until a hearing later this month.

According to the docs, Cintron sent Jasmine THOUSANDS of messages from 2009-2011 -- including 75 YouTube videos -- and in one particularly disturbing clip ... he offered $5,000 to anyone who would kill her.

But that's just the beginning -- Jasmine claims, "In a couple of the videos, he has appeared holding deadly weapons, i.e. a gun, machete knives stating that he was going to find me, rape me, and kill me."

According to Jasmine, Cintron also sent her a Twitter message along with a schedule of her performances, writing, "You're dead Jasmine. I swear to God I'm going to kill you. I will blow your f**king head off bitch."

Jasmine -- who also starred in Bieber's "Baby" video -- claims Steven has also threatened to kill her mom, her current boyfriend, and her little brother ... and the singer has been living in constant "panic mode."

Shocker ... the restraining order also blocks Cintron from contacting Jasmine on the Internet, and posting any more YouTube videos about her.