Rigveda 10.88.11

य॒देदे॑न॒मद॑धुर्य॒ज्ञिया॑सो दि॒वि दे॒वाः सूर्य॑मादिते॒यम् ।य॒दा च॑रि॒ष्णू मि॑थु॒नावभू॑ता॒मादित्प्राप॑श्य॒न्भुव॑नानि॒ विश्वा॑॥

yadedenamadadhuryajñiyāso divi devāḥ sūryamāditeyam |yadā cariṣṇū mithunāvabhūtāmāditprāpaśyanbhuvanāni viśvā ||

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