Śatapatha Brāhmaṇa ("of a hundred paths") 7.1.2.19

7.1.2.19

tā vā etāstisro 'nuṣṭubhaḥ | cita eṣa gārhapatyastadyadetā atra tisro 'nuṣṭubhaḥ sampādayantyatra hyeveme tadā sarve lokā bhavanti tato 'nyatarāṃ dvātriṃśadakṣarāmanuṣṭubhamāhavanīyaṃ haranti sa āhavanīyaḥ sā dyaustaciro 'thehānyatarā pariśiṣyate sa gārhapatyaḥ sā pratiṣṭhā sa u ayaṃ lokaḥ

The Gârhapatya pile thus is those three anushtubh verses. And as to why they make up three anushtubhs in this (Gârhapatya), it is because all these (three) worlds then come to be (contained) therein. From it they take one of the two (first) anushtubhs of thirty-two syllables (to be) the Âhavanîya,--that Âhavanîya is that sky, that head (of Pragâpati). Then one of the two (anushtubhs) is left here (to be) this Gârhapatya, this foundation, this very (terrestrial) world.