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

“He gladdened then. I would not slip again,
And baulk the death of half its shame and pain.
I, his best sword, must fall, in earnest fight.
The old despair was coward—he was right.
Now, king, I pay your debt. A purple stain
Hides his laced throat—I sober at the sight.” [via]