Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.2.2

9.2.2.2

atha ṣoḍaśagṛhītaṃ gṛhṇīte | ṣoḍaśakalaḥ prajāpatiḥ prajāpatiragnirātmasammitenaivainametadannena prīṇāti yadu vā ātmasammitamannaṃ tadavati tanna hinasti yadbhūyo hinasti tadyatkanīyo na tadavati samānyāṃ sruci gṛhṇīte samāno hi sa yametatprīṇāti vaiśvakarmaṇābhyāṃ juhoti viśvakarmāyamagnistamevaitatprīṇāti tisra āhutīrjuhoti trivṛdagniryāvānagniryāvatyasya mātrā tāvataivainametadannena prīṇāti

He then takes (ghee) in sixteen ladlings,--Pragâpati consists of sixteen parts, and Pragâpati is Agni: he thus regales him with food proportionate to his body; and the food which is proportionate to the body satisfies and does no injury; but that which is excessive does injury, and that which is too little does not satisfy. He takes (the oblations) in the same offering-ladle, for one and the same (Agni) is he whom he regales therewith. With two (verses) addressed to Visvakarman he offers; for this Agni is Visvakarman (the all-worker): it is him he thereby gratifies. Three oblations he offers,--threefold is Agni: as great as Agni is, as great as is his measure, with so much food he thus regales him.