Rigveda 1.109.8
पुरं॑दरा॒ शिक्ष॑तं वज्रहस्ता॒स्माँ इ॑न्द्राग्नी अवतं॒ भरे॑षु ।तन्नो॑ मि॒त्रो वरु॑णो मामहन्ता॒मदि॑ति॒: सिन्धु॑: पृथि॒वी उ॒त द्यौः॥
puraṃdarā śikṣataṃ vajrahastāsmām̐ indrāgnī avataṃ bhareṣu |tanno mitro varuṇo māmahantāmaditi: sindhu: pṛthivī uta dyauḥ ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book