"Every being fears punishment; every being fears death, just as you do. Therefore do not kill or cause to kill."
Dhammapada Ch. 10
"Is there a deed, Rahula, thou dost wish to do? Then bethink thee thus: Is this deed conducive to my own harm, or to others harm, or to that of both? Then is this a bad deed entailing suffering. Such a deed must thou surely not do."
Majjhima Nikaya 1.415
"All beings tremble before violence. All fear death. All love life. See yourself in others. Then whom can you hurt? What harm can you do?"