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 I heard the voice of harpers harping with their harps: 3And they sung as it were a new song before the throne, and before the four beasts, and the elders: and no man could learn that song but the hundred and forty and four thousand, who were redeemed from the earth. 4These are they who were not defiled with women; for they are virgins. These are they who follow the Lamb wherever he goeth. These were redeemed from among men, being the firstfruits to God and to the Lamb.1 5And in their mouth was found no guile: for they are without fault before the throne of God.