Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.4.22

3.1.4.22

tadāhuḥ | etāmevaikāṃ juhuyādyasmai kāmāyetarā hūyanta etayaiva taṃ kāmamāpnotīti tāṃ vai yadyekāṃ juhuyātpūrṇāṃ juhuyātsarvaṃ vai pūrṇaṃ sarvamevainayaitadāpnotyatha yatsruvamabhipūrayati srucaṃ tadabhipūrayati tām pūrṇāṃ juhotyanvaivaitaducyate sarvāstveva hūyante

As to this they say, 'Let him offer only this one: for whatever object the others are offered, that object he gains even by this one.' And, indeed, if he offers only this one, he would offer a full-offering; and the full means everything: hence he gains everything by this (oblation). And by filling the dipping-spoon (sruva), he fills the offering-spoon (guhû), and the latter he offers full. This, however, is a mere statement (of others’ views), but all (five) libations are offered.