Rigveda 10.18.10

उप॑ सर्प मा॒तरं॒ भूमि॑मे॒तामु॑रु॒व्यच॑सं पृथि॒वीं सु॒शेवा॑म् ।ऊर्ण॑म्रदा युव॒तिर्दक्षि॑णावत ए॒षा त्वा॑ पातु॒ निॠ॑तेरु॒पस्था॑त्॥

upa sarpa mātaraṃ bhūmimetāmuruvyacasaṃ pṛthivīṃ suśevām |ūrṇamradā yuvatirdakṣiṇāvata eṣā tvā pātu niṝterupasthāt ||

Our plain-language meaning of this verse is waiting for scholar review.