Shiva Purana
संसृज्य दर्भैस्तौ वह्नौ संताप्य प्रोक्षयेत्पुनः ॥ पारार्षर्च्यस्वसूत्रोक्तक्रमेण शिवपूर्वकैः ॥ २१ ॥
After mixing the two with the darbha grass, heat the fire and sprinkle it again. They worshiped Pararsha in the order prescribed by their own Sutras and preceded Shiva.
english translation
saMsRjya darbhaistau vahnau saMtApya prokSayetpunaH ॥ pArArSarcyasvasUtroktakrameNa zivapUrvakaiH ॥ 21 ॥
hk transliteration by Sanscript