Revelation 2:16-17

Repent therefore; or else I come to thee quickly, and I will make war against them with the sword of my mouth. He that hath an ear, let him hear what the Spirit saith to the churches. To him that overcometh, to him will I give of the hidden manna, and I will give him a white stone, and upon the stone a new name written, which no one knoweth but he that receiveth it.