Rigveda 8.13.29
इ॒मा अ॑स्य॒ प्रतू॑र्तयः प॒दं जु॑षन्त॒ यद्दि॒वि ।नाभा॑ य॒ज्ञस्य॒ सं द॑धु॒र्यथा॑ वि॒दे॥
imā asya pratūrtayaḥ padaṃ juṣanta yaddivi |nābhā yajñasya saṃ dadhuryathā vide ||
Our plain-language meaning of this verse is waiting for scholar review.