Revelation 5:9-10

And they sang a new song, saying, "Worthy are you to take the scroll and to open its seals; for you were slain, and with your blood purchased men for God from every tribe and tongue and people and nation.

Revelation 14:3

And they sang a new song before the throne and before the four living creatures and before the elders. No one could learn the song except the hundred and forty-four thousand who had been redeemed from the earth.

Treasury of Scripture Knowledge

Summary

I will sing a new song unto thee, O God: upon a psaltery and an instrument of ten strings will I sing praises unto thee.

Bible References

Sing a new

Revelation 5:9
And they sang a new song, saying, "Worthy are you to take the scroll and to open its seals; for you were slain, and with your blood purchased men for God from every tribe and tongue and people and nation.
Revelation 14:3
And they sang a new song before the throne and before the four living creatures and before the elders. No one could learn the song except the hundred and forty-four thousand who had been redeemed from the earth.