NĪLARUDRA UPANISHAD · 9

असौ यस्ताम्रो अरुण उत बभ्रुर्विलोहितः ।
ये चेमे अभितो रुद्रा दिक्षु श्रिताः सहस्रशो वैषां हेड ईमहे ॥ ९ ॥

asau yastāmro aruṇa uta babhrurvilohitaḥ ।
ye ceme abhito rudrā dikṣu śritāḥ sahasraśo vaiṣāṃ heḍa īmahe ॥ 9 ॥

This Aruna of the dawn that is tawny and copper-red and scarlet-hued, and these thy Violent Ones round about that dwell in the regions in their thousands, verily, it is these whom we desire.

Sri Aurobindo · CWSA 18, p. 291