Rigveda 10.5.2

स॒मा॒नं नी॒ळं वृष॑णो॒ वसा॑ना॒: सं ज॑ग्मिरे महि॒षा अर्व॑तीभिः ।ऋ॒तस्य॑ प॒दं क॒वयो॒ नि पा॑न्ति॒ गुहा॒ नामा॑नि दधिरे॒ परा॑णि॥

samānaṃ nīḷaṃ vṛṣaṇo vasānā: saṃ jagmire mahiṣā arvatībhiḥ |ṛtasya padaṃ kavayo ni pānti guhā nāmāni dadhire parāṇi ||

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