Valmiki Ramayana Bala Kanda Sarga 47 Shloka 5
Original Shlokaब्रह्मलोकं चरत्वेक इन्द्रलोकं तथाऽपर:। दिवि वायुरिति ख्यातस्तृतीयोऽपि महायशा:।।1.47.5।।
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एक: one, ब्रह्मलोकम् in Brahma loka, चरतु may move about, तथा similarly, अपर: another, इन्द्रलोकम् Indra loka, महायशा: highly renowned, तृतीयोऽपि third one, वायुरिति known as Vayu, ख्यात: wellknown, दिवि in this universe, move about.
Among them, one will move about in Brahmaloka, another in Indraloka, and the third, well known as vayu will move around in the sky.