Zulm va zulm qilish eng katta gunohlardan bo'lib, ular adolatga qarshi turadi, adolat esa osmonlar va yer uning ustiga qurilgan. Alloh ~ adolatni o'rnatishlari uchun O'z Elchilarini va Kitoblarini yubordi. Haqsiz, hech qanday huquqsiz nohaq qotillik qilish katta gunohdir. Islom bunday yomon ishlarga ko'plab misollar keltiradi, masalan, bolani o'z rizqi (ya'ni ovqat, ichimlik va pul)ga sherik bo'lib qolishidan qo'rqib o'ldirish; o'z borligiga sabab bo'lgan ota-onani o'ldirish; qarindoshni o'ldirish. Bunday yomon ishning darajasi ish mohiyatiga qarab farq qiladi; shuning uchun Qiyomat kuni eng og'ir jazoga loyiq bo'ladigan kishi payg'ambarni o'ldirgan kishidir, undan keyin imomni yoki odamlar orasida adolatni buyurgan va ularni Alloh yo'liga chaqirgan olimni o'ldirgan kishi turadi. Alloh ~ mo'minni qasddan o'ldirish uchun jazoni abadiy Do'zaxda qolish, Rabbning la'nati va g'azabi ostida bo'lish deb belgilagan.

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.