Revelation 2:21-23

21And I gave her time to repent of her immorality; and she repented not. 22Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds. 23And I will kill her children with death; and all the churches shall know that I am he who searcheth the reins and hearts: and I will give to each one of you according to your works.