But his mind.....

In the name of Allah, the Gracious, the Merciful. All praise belongs to Allah,

But his mind induced him to kill his brother, so he killed him and became one of the losers.

Then Allah sent a raven which scratched in the ground, that He might show him how to hide the corpse of his brother. He said, ‘Woe is me! Am I not able to be even like this raven so that I may hide the corpse of my brother?’ And then he became regretful. On account of this, We prescribed for the children of Israel that whosoever killed a person — unless it be for killing a person or for creating disorder in the land — it shall be as if he had killed all mankind; and whoso gave life to one, it shall be as if he had given life to all mankind. And Our Messengers came to them with clear Signs, yet even after that, many of them commit excesses in the land. The reward of those who wage war against Allah and His Messenger and strive to create disorder in the land is only this that they be slain or crucified or their hands and their feet be cut off on alternate sides, or they be expelled from the land. That shall be a disgrace for them in this world, and in the Hereafter they shall have a great punishment; Except those who repent before you have them in your power. So know that Allah is Most Forgiving, Merciful. O you who believe! fear Allah and seek the way of approach unto Him and strive in His way that you may prosper. Surely, if those who disbelieve had all that is in the earth and as much over again, to ransom themselves therewith from the punishment of the Day of Resurrection, it would not be accepted from them; and they shall have a painful punishment. They will wish to come out of the Fire, but they will not be able to come out of it, and they shall have a lasting punishment. ’  – Al-Quran 5: 31-38.

Narrated By Ibn 'Umar(RA) : Allah's Apostle said, "A faithful believer remains at liberty regarding his religion unless he kills somebody unlawfully."