The prohibition and glorification of killing

One of the great foundations upon which Islamic legislation was based on achieving and preserving the interests of the servants, for this, the five necessities that the Sharia recommended to preserve and care for them are the preservation of religion, the preservation of the soul, the preservation of supply, the preservation of money, the preservation of the offspring, and the preservation of the soul. To be wasted and unlawfully shed and made the killing of one soul like killing all people is an exaggeration in maximizing the matter of killing injustice and preaching to its affairs, that is, just as killing all people is a great ugliness for every one, so also the killing of the one must be so.