1. Do not killThe first precept is

1. Do not kill
The first precept is to not kill . It is very negative to kill someone, even a person who does harm because if we kill him (or her) it is a human being that will be killed not his (her) actions. You even have to stay clear from killing animals because these are beings which suffer when they are injured. If you do respect animals, even the small insects sometimes they feel it and are nice to you.
When you hurt someone a person or an animal it is just like hurting yourself because all our deeds redound to us sooner or later. Sometimes you feel guilty and it can be terribly painful and sometimes for long, even if it appears later. When you help people wha get problems (even if you don't know them), you feel happy, you are well-liked and respected. If you do things you would not like to be done to you, it is the opposite, you will do debts which will cause you unpleasantness.