Valmiki Ramayana Aranya Kanda Sarga 5 Shloka 25
Original Shlokaप्रयाते तु सहस्राक्षे राघवस्सपरिच्छदः। अग्निहोत्रमुपासीनं शरभङ्गमुपागमत्।।3.5.25।।
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सहस्राक्षे the thousandeyed Indra, प्रयाते having departed, राघवः Rama, सपरिच्छदः along with his retinue (Sita and Lakshmana), अग्निहोत्रम् fire altar, उपासीनम् sitting by the side, शरभङ्गम् Sarabhanga, उपागमत् approached.
When Indra departed like that, Rama with his retinue (Sita and Lakshmana) went to Sarabhanga who was sitting by the side of the firealtar (for Agnihotra).