Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.5.16

4.4.5.16

sa ājyasyopastīrya | puroḍāśasyāvadyannāha varuṇāyānubrūhītyatra haika ṛjīṣasya dviravadyanti tadu tathā na kuryācarīraṃ vā etadbhavati nālamāhutyai dviravadyati sakṛdabhighārayati pratyanaktyavadāne āśrāvyāha varuṇaṃ yajeti vaṣaṭkṛte juhoti

Having made an 'underlayer' of ghee (in the offering-spoon), he says, while making the cuttings from the cake, 'Recite (the invitatory prayer) to Varuna!' Here now some make two cuttings from the Soma-husks, but let him not do so; for that (heap of husks) is an empty body, unfit for offering. He makes two cuttings (from the cake) and bastes them once with ghee, and anoints (replenishes the places whence) the cuttings (have been made). Having called for the Sraushat, he says, 'Recite the offering prayer to Varuna!' and offers as the Vashat is uttered.