Natyashastra
स्तम्भेषु मत्तवारण्याः स्थापिता परिपालने । भूतयक्षपिशाश्च गुह्यकाश्च महाबलाः ॥ ९१॥
The wild elephants were placed on the pillars for protection, along with powerful spirits, ghosts, and hidden beings.
english translation
stambheSu mattavAraNyAH sthApitA paripAlane । bhUtayakSapizAzca guhyakAzca mahAbalAH ॥ 91॥
hk transliteration by Sanscript