In the closing minutes of regulation of Game 6 on Tuesday, a significant portion of the home crowd left American Airlines Arena early, missing the Heat's dramatic 103-100 overtime comeback.
Bosh chastised the fans who headed for the exits during a media session on Wednesday.
"For all those guys [fans] who left, make sure they don't come to Game 7," he said. "We only want the guys who want to stay. ... You never give up. People gave up on us. They can stay where they are and watch the game at home."
A portion of those who left attempted to get back into the building, but were denied access by security officials, who enforced the arena's no reentry policy.
"You can't get let back in after you leave," Bosh said. "I know that. Hell, I've been to games. You can't leave a game and then come back. It doesn't make any sense. You left. It's not punishment, that's protocol."
Miami made up a five-point deficit in the last 28 seconds of regulation thanks to three-pointers from LeBron James and Ray Allen. Afterward, James called Game 6 "by far the best game" that he has ever been a part of during his 10-year career.
The Heat and Spurs, deadlocked at three games apiece, will play the decisive Game 7 on Thursday. The Finals has gone to seven games in only two of the previous 18 years: 2010 (Lakers and Celtics) and 2005 (Spurs and Pistons).
Bosh, an eight-time All-Star, is seeking his second title. He finished with 10 points and 11 rebounds in Game 6 and made a number of crucial defensive plays down the stretch.
“We are literally sitting in the crowd here,” Boyle said, in an audio file of the broadcast posted on Miami sports site PageQSports.com. “These losers are leaving. They are flocking to the exits with their team down by three. This city does not only not deserve this team, they don’t deserve any team." Video via YouTube user John Feitelberg