Valmiki Ramayana Kishkindha Kanda Sarga 26 Shloka 30

ततः then, मन्त्रविदः who recite vedic hymns, जनाः people, कुशपरिस्तीर्णम् strewn with kusa grass, समिद्धम् kindled, जातवेदसम् fire, मन्त्रपूतेन by sanctifying with mantras, हविषा with havis, हुत्वा having offered,

Then the priests (people who recite Vedic hymns) strew around kusa grass, kindled sacred fire with recitation of mantras and made offerings of havis into the fire.