Rig Veda
गुहा॑ हि॒तं गुह्यं॑ गू॒ळ्हम॒प्स्वपी॑वृतं मा॒यिनं॑ क्षि॒यन्त॑म् । उ॒तो अ॒पो द्यां त॑स्त॒भ्वांस॒मह॒न्नहिं॑ शूर वी॒र्ये॑ण ॥ गुहा हितं गुह्यं गूळ्हमप्स्वपीवृतं मायिनं क्षियन्तम् । उतो अपो द्यां तस्तभ्वांसमहन्नहिं शूर वीर्येण ॥
Indra, hero, you have slain by your prow the glorified Ahi, hidden privy in a cave, lurking in concealment, covered by the waters in which he was abiding, and arresting the rains in the sky.
english translation