Śatapatha Brāhmaṇa ("of a hundred paths") 11.7.4.1

11.7.4.1

sa yatpaśunā yakṣyamāṇaḥ ekāratniṃ yūpaṃ kuruta imameva tena lokaṃ jayatyatha yaddvyaratnimantarikṣalokameva tena jayatyatha yattryaratniṃ divameva tena jayatyatha yaccaturartniṃ diśa eva tena jayati sa vā eṣa tryaratnirvaiva caturaratnirvā paśubandhayūpo bhavatyatha yo'ta ūrdhvaḥ saumyasyaiva so'dhvarasya

Now, when he who is about to perform an animal sacrifice makes a stake one cubit long, he thereby gains this (terrestrial) world; and when (he makes) one two cubits long, he thereby gains the air-world; and when be makes one three cubits long, he thereby gains the heavens; and when he makes one four cubits long, he thereby gains the regions. But, indeed, that sacrificial stake of the (ordinary) animal sacrifice is either three or four cubits long, and one that is above that belongs to the Soma-sacrifice.