Hi, my promise is in Revelation 14:1-4 which says, The I looked and there before me was the Lamb standing one mount Zion, and with him 144,000 who had his name and fathers name written on there foreheads. And I heard a sound from heaven like the roar of rushing waters and like a loud peal of thunder. The sound I heard was like the sound of harpists playing there harps. and the sang a new song before the throne and before the four living creatures and elders. No one could learn this song except the 144,000 who had been redeemed from the earth. these are those who did not defile themselves with women, for the kept themselves pure. the follow the Lamb where ever he goes. the were purchased from among and offered from firstfruits of God and the Lamb.
So the promise is that if we keep ourselves pur, or if we come to Jesus, then we will be able to learn the new song.