Valmiki Ramayana Ayodhya Kanda Sarga 20 Shloka 16

तदा then, रामः Rama, शुभम् auspicious, मातु: अन्तःपुरम् inner apartment of his mother, प्रविश्य having entered, तत्र there, हुताशनम् to Agni, हावयन्तीम् exhorting the priests to offer sacrificial oblations, मातरम् to mother, ददर्श saw.

Rama entered the auspicious inner apartment of his mother and saw her exhorting the priests to offer sacrificial oblations to Agni (firegod).