The Women - 4:85
Whoever mediates a good deed has a credit for himself. And whoever mediates evil, for him is a share of it. Allah controls everything.
The share of the mediator of evil:
The Cattle/6:160
Whoever brings good, he shall have ten times what he brought. And whoever brings evil, he shall be punished only with its equivalent, and they shall not be wronged.
Prophet Jonah/10:27
And those who do evil will be repaid with the same evil. A sense of humiliation covers their faces. They have no protector except Allah. Their faces are covered as if with a piece of the dark night. They are the people of the Fire; they will abide therein forever.