Rigveda 6.5.4

यो न॒: सनु॑त्यो अभि॒दास॑दग्ने॒ यो अन्त॑रो मित्रमहो वनु॒ष्यात् ।तम॒जरे॑भि॒र्वृष॑भि॒स्तव॒ स्वैस्तपा॑ तपिष्ठ॒ तप॑सा॒ तप॑स्वान्॥

yo na: sanutyo abhidāsadagne yo antaro mitramaho vanuṣyāt |tamajarebhirvṛṣabhistava svaistapā tapiṣṭha tapasā tapasvān ||

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