Rigveda 8.12.3

येन॒ सिन्धुं॑ म॒हीर॒पो रथाँ॑ इव प्रचो॒दय॑: ।पन्था॑मृ॒तस्य॒ यात॑वे॒ तमी॑महे॥

yena sindhuṃ mahīrapo rathām̐ iva pracodaya: |panthāmṛtasya yātave tamīmahe ||

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