Zalunci da danniya suna cikin manyan zunubai domin suna adawa da adalci, wanda sama da ƙasa suka kafu a kansa. Allah ~ ya aiko Manzanninsa da Littattafansa domin mutane su kafa adalci a tsakaninsu. Kisan rai ba bisa ka'ida ba, ba tare da wani hakki ba, babban zunubi ne. Musulunci ya ambaci misalai da dama na irin wannan mummunan aiki, kamar kashe ɗa saboda tsoron cewa zai raba mutum da arzikinsa (watau abinci, abin sha, da kuɗi); kashe iyaye waɗanda su ne sanadin samuwar mutum; kashe dangi. Matakin wannan mummunan aiki yana bambanta gwargwadon yanayin aikin kansa; saboda haka, wanda zai karɓi mafi girman hukunci a Ranar Tashin Alƙiyama shi ne wanda ya kashe annabi, sai kuma wanda ya kashe Imami, ko malami wanda ya umarci adalci a tsakanin mutane kuma ya kira su zuwa ga Tafarkin Allah ~. Allah ~ ya ƙayyade hukuncin kisan mumini da gangan a matsayin zama har abada a cikin Wutar Jahannama, tare da la'anar Ubangiji da fushinsa.

Tyranny and oppression are among the greatest sins because they oppose justice, upon which the heavens and the earth were established. Allah ~ sent His Messengers and Books in order that people might establish justice among themselves. The act of killing unlawfully, without any right, is a great sin. Islam cites many examples of such evil acts, like the killing of one's child for fear that the child might share one's provision (i.e. food, drink, and money); the killing of one's parents who were the cause of one's existence; the killing of one's kin. The grade of such an evil act differs according to the nature of the act itself; therefore, the person who will receive the utmost punishment on the Day of Resurrection is the one who killed a prophet, followed by the one who killed an Imam, or a scholar who commanded justice among people and invited them to the Path of Allah ~- Allah ~ has set the punishment for the intentional killing of a believer as dwelling eternally in the Hell-Fire, with the Curse and Anger of the Lord.