Matt Barnes says the death of rapper XXXTentacion should serve as a warning to Tekashi69 ... that he could be next unless he stops getting mixed up with real life gang members.
The ex-NBA star comes from a tough background and knows how bad things can get when you push a real life gangbanger too far.
Barnes insinuates that XXX got in too deep with real killers and learned the hard way what happens when you mess with the wrong people.
Then comes the warning to Tekashi -- who Barnes says is "running in every hood, talking sh*t to everybody.