NĪLARUDRA UPANISHAD · 1

ॐ अपश्यं त्वावरोहन्तं दिवितः पृथिवीमवः ।
अपश्यमस्यन्तं रुद्रं नीलग्रीवं शिखण्डिनम् ॥ १ ॥

oṃ apaśyaṃ tvāvarohantaṃ divitaḥ pṛthivīmavaḥ ।
apaśyamasyantaṃ rudraṃ nīlagrīvaṃ śikhaṇḍinam ॥ 1 ॥

OM. Thee I beheld in thy descending down from the heavens to the earth, I saw Rudra, the Terrible, the azure-throated, the peacock-feathered, as he hurled.