Rigveda 9.112.4

अश्वो॒ वोळ्हा॑ सु॒खं रथं॑ हस॒नामु॑पम॒न्त्रिण॑: ।शेपो॒ रोम॑ण्वन्तौ भे॒दौ वारिन्म॒ण्डूक॑ इच्छ॒तीन्द्रा॑येन्दो॒ परि॑ स्रव॥

aśvo voḷhā sukhaṃ rathaṃ hasanāmupamantriṇa: |śepo romaṇvantau bhedau vārinmaṇḍūka icchatīndrāyendo pari srava ||

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