'New Song' in the Bible

And they sang a new song [of glorious redemption], saying,“Worthy and deserving are You to take the scroll and to break its seals; for You were slain (sacrificed), and with Your blood You purchased people for God from every tribe and language and people and nation.

And they sang a new song before the throne [of God] and before the four living creatures and the elders; and no one could learn the song except the hundred and forty-four thousand who had been purchased (ransomed, redeemed) from the earth.