Valmiki Ramayana Aranya Kanda Sarga 5 Shloka 14

पुरुहूतस्य of Indra who is often invoked, शक्रस्य of Indra, ये those, हयाः horses, नः for us, पुरा earlier, श्रुताः heard, ते those, हरयः horses, अन्तरिक्षगताः stationed in the sky, दिव्याः wonderful, इमे we, ध्रुवम् surely.

The horses of Indra, who is often invoked (during sacrificial rituals) and about whom we have heard earlier, are now stationed in the sky.