Śatapatha Brāhmaṇa ("of a hundred paths") 7.4.1.40

7.4.1.40

tāvabravīt | upa metam prati ma etaddhattaṃ yena me yuvamudakramiṣṭamiti tābhyāṃ vai nau sarvamannam prayaceti tau vai mā bāhū bhūtvā prapadyethāmiti tatheti tābhyāṃ vai sarvamannam prāyacattāvenam bāhū bhūtvā prāpadyetāṃ tasmādbāhubhyāmevānnaṃ kriyate bāhubhyāmadyate bāhubhyāṃ hi sa sarvamannam prāyacat

He (Pragâpati) said to those two, 'Come ye to me, and put back into me that (substance) of mine wherewith ye have gone off!'--'Well then, bestow thou all food here on us two!' they said.--'Well then, join me, becoming these two arms of mine!'--'So be it!' He bestowed all food on them, and they joined him, becoming those two arms of his: hence it is by the arms that food is made, and by means of the arms that it is eaten, for he (Pragâpati) bestowed all food on the two arms.