Revelation 14:2-4

New Century Version

² And I heard a sound from heaven like the noise of flooding water and like the sound of loud thunder. The sound I heard was like people playing harps. ³ And they sang a new song before the throne and before the four living creatures and the elders. No one could learn the new song except the one hundred forty-four thousand who had been bought from the earth. ⁴ These are the ones who did not do sinful things with women, because they kept themselves pure. They follow the Lamb every place he goes. These one hundred forty-four thousand were bought from among the people of the earth as people to be offered to God and the Lamb.