Śatapatha Brāhmaṇa ("of a hundred paths") 8.6.3.4

8.6.3.4

te 'bruvan | madhya evopadadhāmahai sa no madhya upahitaḥ sarveṣām bhaviṣyatīti taṃ madhya upādadhata tadetāṃ rāddhimātmannadadhata madhyato madhyata evaitadetāṃ rāddhimātmannadadhata tathaivaitadyajamāno yadgārhapatyamupadadhātyetāmevaitadrāddhimātmandhatte madhyato madhyata evaitadetāṃ rāddhimātmandhatte

They spake, 'Let us lay it down in the middle: when laid down in our midst, it will belong to all of us.' They laid it down in the middle (of the fifth layer), and thus they laid that success into the self (or the body of the altar);--in the middle (they laid it): they thus laid that success into the very middle of (Agni's and their own) self. And in like manner does the Sacrificer, when he lays down the Gârhapatya, lay that success into (his own) self; and (by laying it down) in the middle, he lays that success into the very middle of the self.