Quran 5:32 — The Feast (Al-Ma'edah)

Because of this, we decreed for the Children of Israel that anyone who murders any person who had not committed murder or horrendous crimes, it shall be as if he murdered all the people. And anyone who spares a life, it shall be as if he spared the lives of all the people. Our messengers went to them with clear proofs and revelations, but most of them, after all this, are still transgressing.

[5:31] GOD then sent a raven to scratch the soil, to teach him how to bury his brother's corpse. He said, "Woe to me; I failed to be as intelligent as this raven, and bury my brother's corpse." He became ridden with remorse.

[5:33] The just retribution for those who fight GOD and His messenger, and commit horrendous crimes, is to be killed, or crucified, or to have their hands and feet cut off on alternate sides, or to be banished from the land. This is to humiliate them in this life, then they suffer a far worse retribution in the Hereafter.