From Samuel Taylor Coleridge's "The Rime of the Ancient Mariner" VI.37-42
Like one, that on a lonesome road
Doth walk in fear and dread,
And having once turned round walks on,
And turns no more his head;
Because he knows, a frightful fiend
Doth close behind him tread.
"The Rime of the Ancient Mariner" in its entirety