Revelation 14:2-5

2And I heard a voice from heaven, as the voice of many waters, and as the voice of a great thunder: and the voice which I heard was as the voice of harpers harping with their harps:

3and they sing as it were a new song before the throne, and before the four living creatures and the elders: and no man could learn the song save the hundred and forty and four thousand, even they that had been purchased out of the earth.

4These are they which were not defiled with women; for they are virgins. These are they which follow the Lamb whithersoever he goeth. These were purchased from among men, to be the firstfruits unto God and unto the Lamb.

5And in their mouth was found no lie: they are without blemish.