AVŚ 18.4.4
त्रयः सुपर्णा उपरस्य मायू नाकस्य पृष्ठे अधि विष्टपि श्रिताः । स्वर्गा लोका अमृतेन विष्ठा इषम् ऊर्जं यजमानाय दुह्राम् ॥४॥
trayaḥ suparṇā uparasya māyū nākasya pṛṣṭhe adhi viṣṭapi śritāḥ | svargā lokā amṛtena viṣṭhā iṣam ūrjaṃ yajamānāya duhrām ||4||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
Three eagles (suparṇá)...upon the back of the firmament (nā́ka), at the summit (? viṣṭáp) are set (çritá); let the heavenly (svargá) worlds, filled (?) with amṛ́ta, yield (duh) food, refreshment to the sacrificer.
Translated by William Dwight Whitney (1905)