Shiva Purana
अपीठे पीठमावेश्य कृत्वा संप्रोक्षणं विधिम् ॥ यजेत्तत्र शिवं तेषां प्रतिष्ठा न विधीयते ॥ ६१ ॥
After placing a seat on an unseated body one should perform the ritual of sprinkling water One should worship Lord Shiva there and their establishment is not prescribed.
english translation
apIThe pIThamAvezya kRtvA saMprokSaNaM vidhim ॥ yajettatra zivaM teSAM pratiSThA na vidhIyate ॥ 61 ॥
hk transliteration by Sanscript