2. Mose 20:13

The other Five Words or commandments, which determine the duties to one's neighbour, are summed up in Lev 19:18 in the one word, "Love thy neighbour as thyself." The order in which they follow one another is the following: they first of all secure life, marriage, and property against active invasion or attack, and then, proceeding from deed to word and thought, they forbid false witness and coveting. (Note: Luther has pointed out this mirum et aptum ordinem, and expounds it thus: Incipit prohibitio a majori usque ad minimum, nam maximum damnum est occisio hominis, deinde proximum violatio conjugis, tertium ablatio facultatis. Quod qui in iis nocere non possunt, saltem lingua nocent, ideo quartum est laesio famae. Quodsi in iis non praevalent omnibus, saltem corde laedunt proximum, cupiendo quae ejus sunt, in quo et invidia proprie consistit.) If, therefore, the first three commandments in this table refer primarily to deeds; the subsequent advance to the prohibition of desire is a proof that the deed is not to be separated from the disposition, and that "the fulfilment of the law is only complete when the heart itself is sanctified" (Oehler). Accordingly, in the command, "Thou shalt not kill," not only is the accomplished fact of murder condemned, whether it proceed from open violence or stratagem (Exo 21:12, Exo 21:14, Exo 21:18), but every act that endangers human life, whether it arise from carelessness (Deu 22:8) or wantonness (Lev 19:14), or from hatred, anger, and revenge (Lev 19:17-18). Life is placed at the head of these commandments, not as being the highest earthly possession, but because it is the basis of human existence, and in the life the personality is attacked, and in that the image of God (Gen 9:6). The omission of the object still remains to be notice…

All things being prepared for the solemn promulgation of the divine law, we have, in this chapter, I. The ten commandments, as God himself spoke them upon mount Sinai (v. 1-17), as remarkable a portion of scripture as any in the Old Testament. II. The impressions made upon the people thereby (Exo 20:18-21). III. Some particular instructions which God gave privately to Moses, to be by him communicated to the people, relating to his worship (Exo 20:22, etc.).

20:13 murder: This is the correct rendering of the Hebrew word. There is another word that connotes mere killing. Taking human life is not prohibited, per se, but the intentional killing of another for personal reasons is prohibited. This principle tells us that God values our individual, physical lives. Jesus expanded on this command in Matt 5:21-26.