score:13
Jesus is talking here about the resurrection of the dead. Because of what Christ did all will live again. So yes you could die for the gospel but you would gain eternal life in Christ.
Just adding some scripture to back this up:
(KJV) 1 Corinthians 15:42 So also is the resurrection of the dead. It is sown in corruption; it is raised in incorruption:
Just supporting that we will be raised from this mortal state which is corruptible (hence why we die) to an immortal state that is incorruptible.