Shiva Purana
श्मशाननिलयस्त्र्यक्षस्स तुरप्रतिमाकृतिः॥ लोकोत्तरस्फुटोलोकः त्र्यंबको नागभूषणः ॥ ९८॥
The three-eyed demon who lives in the graveyard is in the shape of a horse The crystalline world beyond the world is the triangular ornament of the serpent.
english translation
zmazAnanilayastryakSassa turapratimAkRtiH॥ lokottarasphuTolokaH tryaMbako nAgabhUSaNaH ॥ 98॥
hk transliteration by Sanscript