The Nameless Quest in The Gate of the Sanctuary from The Temple of the Holy Ghost (Collected Works, Vol I) by Aleister Crowley.

“Where am I? Seven days my spirit fell,
Down, down the whirlpools and the gulfs of hell:
Seven days a corpse lay desolate—at last
Back drew the spirit and the soul aghast
To animate that clay—O horrible!
The resurrection pang is hardly past.
Yet in awhile I stumbled to my feet
To flee—no nightmare could be worse to meet.
And, spite of that, I knew some deadlier trap
Some worm more poisonous would set—mayhap!” [via]