Atharva Veda 6.63: The symbolical liberation of a sacrificial victim

That collar round thy neck, not to be loosened, which Nirriti the Goddess bound and fastened, I loose for thy long life and strength and vigour. Eat, liberated, food that brings no sorrow.

To thee, sharp-pointed Nirriti, be homage! Loose thou the binding fetters wrought of iron.
To me, in truth, again doth Yama give thee. To him, to Yama, yea, to Death, be homage!

Compassed by death which comes in thousand manners, here art thou fastened to the iron pillar.
Unanimous with Yama and the Fathers, make this man rise and reach the loftiest heaven.

Thou, mighty Agni, good and true, gatherest up all precious things.
Bring us all treasures as thou art enkindled at libation's place.