Shatapatha Brahmana 9.4.3.11

9.4.3.11

dadāhuḥ | daśahaviṣamevaitāmiṣṭiṃ nirvapetsā sarvastomā sarvapṛṣṭhā sarvāṇi candāṃsi sarvā diśaḥ sarva ṛtavaḥ sarvamvetadayamagnistadenaṃ haviṣā devatāṃ karoti yasyai vai devatāyai havirgṛhyate sā devatā na sā yasyai na gṛhyate daśa bhavanti daśākṣarā virāḍvirāḍagnirdaśa diśo diśo 'gnirdaśa prāṇāḥ prāṇā āgneryāvānagniryāvatyasya mātrā tāvataivainametadannena prīṇāti

As to this they say,--Let him prepare this offering (ishti) so as to consist of material for ten oblations;--this (offering) is (performed) with all the stomas and all the prishtha (sâmans); and there are (used in it) all the metres, all the regions, all the seasons--and this Agni (the fire-altar) is all this: he thus, by the (amount of) offering material (taken out for the ishti), makes (Agni) the deity; for only that one is the deity for whom the oblation is prepared, not one for whom it is not prepared. There are (in that case) ten (oblations),--the Virâg (metre) consists of ten syllables, and Agni is virâg (far-shining, or far-ruling); there are ten regions, and Agni (the fire-altar) is the regions; ten vital airs, and Agni is the vital airs: as great as Agni is, as great as is his measure, with so much food he thus gratifies him.