Śatapatha Brāhmaṇa ("of a hundred paths") 9.4.2.13

9.4.2.13

yadveva ruṅnatīrjuhoti | prajāpatervisrastādrugudakrāmattaṃ yatra devāḥ samaskurvaṃstadasminnetābhī ruṅnatībhī rucamadadhustathaivāsminnayametaddadhāti

And, again, as to why he offers the lightsome oblations. When Pragâpati was dismembered, his brilliance departed from him. When the gods restored him, they, by means of these lightsome oblations, endowed him with brilliance; and in like manner does this (Sacrificer) endow him therewith.