Quran and Freedom of Speech

The worshipers of the Most Gracious are those who tread the earth gently, and when the ignorant speak to them, they only utter peace.

25:63

Grossness of Murder

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.

5:32