Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.3.44

9.2.3.44

sapta te agne samidha iti prāṇā vai samidhaḥ prāṇā hyetaṃ samindhate sapta jihvā iti yānamūntsapta puruṣānekam puruṣamakurvaṃsteṣāmetadāha sapta ṛṣaya iti sapta hi ta ṛṣaya āsantsapta dhāma priyāṇīti candāṃsyetadāha candāṃsi vā asya sapta dhāma priyāṇi sapta hotrāḥ saptadhā tvā yajantīti sapta hyetaṃ hotrāḥ saptadhā yajanti sapta yoniriti citīretadāhāpṛṇasvetyā prajāyasvetyetadghrṛteneti reto vai ghṛtaṃ reta evaitadeṣu lokeṣu dadhāti svāheti yajño vai svāhākāro yajñiyamevaitadidaṃ sakṛtsarvaṃ karoti

[He offers, with, Vâg. S. XVII, 79], Thine, O Agni, are seven logs,'--logs mean vital airs, for the vital airs do kindle him;--'seven tongues,'--this he says with regard to those seven persons which they made into one person;--'seven Rishis,'--for seven Rishis they indeed were;--'seven beloved seats,'--this he says with regard to the metres, for his seven beloved seats are the metres;--'sevenfold the seven priests worship thee,'--for in a sevenfold way the seven priests indeed worship him;--'the seven homes,'--he thereby means the seven layers (of the altar);--'fill thou!'--that is, 'generate thou;'--'with ghee,'--ghee means seed: he thus lays seed into these worlds;--'svâhâ!'--the svâhâ (hail!) is the sacrifice; he thus at once makes everything here fit for sacrifice.