Justin Bieber — I Didn’t Spit on Him … I Didn’t Threaten to Kill Him

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Justin Bieber is adamant his neighbor is LYING — insisting he NEVER spat or threatened to kill anyone during a heated exchange at his home in Calabasas … sources close to the singer tell our sources.

Our sources tell us … the singer isn”t denying that he confronted his neighbor when the guy stormed on to his property early Tuesday morning … but Bieber is saying things never turned physical. 

As we first reported, the neighbor was steaming mad when he confronted Bieber … and yelled at Justin for racing his Ferrari around the private community at breakneck speeds.

We”re told Justin believes he had a right to engage the guy in the argument … but the singer is telling people no spit ever left his mouth. JB also insists he never threatened to do the neighbor any harm.

Plus, our sources tell us … Justin”s camp believes the neighbor was trespassing during the entire incident.