Shiva Purana
तथोपवेष्टितस्तिष्ठेन्मंडपे समलंकृते॥ गुर्वासनवरे शुद्धे चैलाजिनकुशोत्तरे॥ १७ ॥
Then he should stand wrapped in a decorated pavilion. On the best seat of the guru on a pure cloth deerskin and kusha grass.
english translation
tathopaveSTitastiSThenmaMDape samalaMkRte॥ gurvAsanavare zuddhe cailAjinakuzottare॥ 17 ॥
hk transliteration by Sanscript