It teaches that thou shalt not murder. As in most cases, a big difference in a small change of word. Antiseptic is taking away lives of micro organism. Our bodies are taking away lives of micro organism by antibodies. Cutting and preparing vegetable and salad is killing.
Murder is the taking away of life illegally.
The final judge of all creation, God, has the last say on what is just and what is legal. So, God decides on what is murder and what is not. Murder is the undeserved removal of life. God gives and God takes. God simply take back what orginally and always belong to Him.