Revelation 14:1-5

Then I looked, and there before me was the Lamb, who was standing on Mount Zion. There were 144,000 people with him. They all had his name and his Father’s name written on their foreheads. And I heard a sound from heaven as loud as the crashing of floodwaters or claps of thunder. But it sounded like harpists playing their harps. The people sang a new song before the throne and before the four living beings and the elders. The only ones who could learn the new song were the 144,000 who had been bought from the earth. No one else could learn it. These are the ones who did not do sinful things with women. They kept themselves pure. Now they follow the Lamb wherever he goes. They were bought from among the people of the earth as the first to be offered to God and the Lamb. They are not guilty of telling lies; they are without fault.