no-secret-sphinxes:

THE PUNISHMENT OF LOKI.

But his punishment did not end here. A snake, whose fangs dropped poison, glided to the top of the rock and leaned his head over to peer at Loki. The eyes of the two met and fixed each other. The serpent could never move away afterwards; but every moment a burning drop from his tongue fell down on Loki’s shuddering face.

In all the world there was only one who pitied him. His kind wife ever afterwards stood beside him and held a cup over his head to catch the poison. When the cup was full, she was obliged to turn away to empty it, and the deadly drops fell again on Loki’s face. He shuddered and shrank from them, and the whole earth trembled. So will he lie bound till the Twilight of the Gods be here.