Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.2.6

9.2.2.6

atha ṣoḍaśagṛhītaṃ gṛhṇīte | aṣṭau prāṇā aṣṭāvaṅgānyetāmabhisampadaṃ samānyāṃ sruci gṛhṇīte samāne hyevātmannaṅgāni ca prāṇāśca bhavanti nānā juhotyaṅgebhyaśca tatprāṇebhyaśca vidhṛtiṃ karoti vaiśvakarmaṇābhyāṃ juhoti viśvakarmāyamagnistamevaitatsaṃskaroti tisra āhutīrjuhoti trivṛdagniryāvānagniryāvatyasya mātrā tāvataivainametadannena saṃskaroti saptadaśabhirṛgbhiḥ saptadaśaḥ prajāpatiḥ prajāpatiragniryāvānāgniryāvatyasya mātrā tāvataivainametatsaṃskarotyekaviṃśatigṛhītena dvādaśa māsāḥ pañca 'rtavastraya ime lokā asāvāditya ekaviṃśa etāmabhisampadam

He then takes (ghee) in sixteen ladlings: eight vital airs, and eight limbs,--this (the symbolical) amount. He takes it in the same spoon, for, indeed, the vital airs and the limbs are in the same body. Separately he offers: he thereby makes a distinction between the vital airs and the limbs. With two (verses) addressed to Visvakarman he offers: Visvakarman is this Agni, it is him he thus puts together. Three oblations he offers,--threefold is Agni: as great as Agni is, as great as is his measure, with so much food he thus restores him. With seventeen verses (he offers),--Pragâpati is seventeenfold, and Pragâpati is Agni: as great as Agni is, as great as is his measure, with so much he thus restores him. With (ghee) taken in twenty-one ladlings (he offers the two oblations),--there are twelve months, five seasons, these three worlds, and yonder sun as the twenty-first: this is the (symbolical) amount (or, correspondence).