If you dream of being injured by weapon, it means this dream is a warning. It’s likely you have offended someone of some people. Those who hate you, or were hurt by you, may desire revenge. Your gut feelings may have warned you and this warning was carried into your brain, which decided to create this type of dream to warn you.
You should reflect on your life and circumstances. Have you grievously injured the feelings of other people? If yes, should you have avoided hurting people? You might wish to examine your conscience and see which aspects may be tweaked to improve your image.