No one can harm anyone without God's approval!

Verse 11 of Chapter 64:

No misfortune befalls except by Allah's command; and Allah will guide the heart of whoever accepts faith in Him; and Allah knows all things.

Verses 22-23 of Chapter 57:

There is no misfortune that reaches in the earth or in your selves but is mentioned in a Book, before We initiate it; indeed this is easy for Allah. So that you may not be saddened upon losing something, nor rejoice upon what you are given; and Allah does not like any boastful, conceited person.