Revelation 2:16-17

Repent of your sin, or I will come to you suddenly and fight against them with the sword of my mouth. “Anyone with ears to hear must listen to the Spirit and understand what he is saying to the churches. To everyone who is victorious I will give some of the manna that has been hidden away in heaven. And I will give to each one a white stone, and on the stone will be engraved a new name that no one understands except the one who receives it.