Śatapatha Brāhmaṇa ("of a hundred paths") 1.2.2.3

1.2.2.3

atha saṃyauti | janayatyai tvā saṃyaumīti yathā vā adhivṛkto 'gneradhi jāyetaivaṃ vai tatsaṃyauti

He then mixes (the two) together, with the text (Vâg. S. I, 22): 'For generation I unite thee!' for, in order that it (the dough or the sacrificial cake prepared from it) may bring offspring to the sacrificer, for his prosperity, for food, and so on,--for these reasons he mixes them together. And he also mixes them together with the intention of placing it (the dough) on (the fire): hence, in order that it (the sacrificial cake) may be produced over the fire, for that purpose also he mixes them together.