Justin Bieber allegedly spit in his neighbor's face and threatened to kill him, is he now being prosecuted for it? Reports say the neighbor who is a 47-year-old successful businessman and father of 3 -- went onto Justin's Calabasas property and screamed, "You can't drive like this!" The man told deputies, Justin responded by saying ,
"Get the f**k out of here,"
and then he spit in the guy's face and said,
"I'm gonna f**king kill you."
The man filed a battery report and we're told he wants Bieber prosecuted and will not back down. Now Law enforcement sources tell TMZ ... Sheriff's investigators will refer the case to the L.A. County District Attorney for review after the investigation is completed, and the Dept. will recommend that criminal battery charges be filed against the singer.

The Dept. believes it's relevant Bieber has shown a pattern of disregard for the law, including speeding tickets, fights, threats, reckless driving, drugs and more.