Shatapatha Brahmana 8.7.4.9

8.7.4.9

dvābhyāṃ-dvābhyāṃ śatābhyām | dvipādyajamāno yajamāno 'gniryāvānagniryāvatyasya mātrā tāvataivāsminnetadamṛtaṃ rūpamuttamaṃ dadhāti pañca kṛtvaḥ pañcacitiko 'gniḥ pañca 'rtavaḥ saṃvatsaraḥ saṃvatsaro 'gniryāvānāgnaryāvatyasya mātrā tāvataivāsminnetadamṛtaṃ rūpamuttamaṃ dadhāti sahasreṇa sarvaṃ vai sahasraṃ sarveṇaivāsminnetadamṛtaṃ rūpamuttamaṃ dadhāti

With two hundred (chips he bestrews him) each time,--two-footed is the Sacrificer, and Agni is the sacrificer: as great as Agni is, as great as is his measure, with so much he thus bestows upon him immortality, that highest form. Five times (he strews),--five-layered is the altar, five seasons make a year, and Agni is the year: as great as Agni is, as great as is his measure, with so much he thus bestows upon him immortality, that highest form. With a thousand (chips he bestrews him),--a thousand means everything: with everything he thus confers upon him immortality, that highest form.