Shatapatha Brahmana 10.1.5

This built fire-altar, in truth, (includes) all these sacrifices:--when he slaughters an animal victim, that is the Agnyâdheya (establishment of the sacred fires); when he collects (the materials for) the fire-pan, that constitutes the oblations of the Agnyâdheya; when he performs the initiation, that is the Agnihotra; and when the initiated puts two logs on (the fire), these are the two oblations of the Agnihotra.

He puts them on in the evening and in the morning, for in the evening and in the morning the Agnihotra oblations are offered;--with one and the same formula, for with one and the same formula the two Agnihotra oblations are offered. Then the driving about (of the fire in the pan), and the taking down (to the water) of the ashes, these two (constitute) the New and Full-moon offerings; and when he builds the Gârhapatya hearth, that is the Kâturmâsya (seasonal offerings); and what takes place from (the building of) the Gârhapatya up to the (sowing of) all-herb (seed, that constitutes) the ishtis, and what takes place after the all-herb (sowing) and prior to (the building of) the layers, that is the animal sacrifices; and the Vishnu-strides which are (performed) at these sacrifices are just these Vishnu-strides; and what muttering of formulas there is that is the Vâtsapra.

The first layer is the Soma-sacrifice; the second the Râgasûya as prior to the consecrations; the third the Vâgapeya; the fourth the Asvamedha (horse-sacrifice); and the fifth the Agnisava. Then the sâmans he sings around the built (altar) are the Mahâvrata(-sâman); the Udgâtri's preliminary muttering (of the text of his chants) on that occasion is the Satarudriya; the 'shower of wealth' the Great Litany; and what takes place subsequent to (the singing of) the sâmans, and prior to the shower of wealth, that is the Hotri's preliminary muttering on that occasion; and what takes place after the shower of wealth is the Grihamedhas (house-sacrifices). Such are all the sacrifices: these he secures by (building) the fire-altar.

Now, then, as to the powers (conferred by the performance) of sacrifices. Verily, he who (regularly) performs the Agnihotra eats food in the evening and in the morning (when he comes to be) in yonder world, for so much sustenance is there in that sacrifice. And he who performs the New and Full-moon sacrifice (eats food) every half-month; and he who performs the Seasonal sacrifice (does so) every four months; and be who performs the animal sacrifice (twice a year, eats food) every six months; and the Soma-sacrificer once a year; and the builder of the fire-altar at his pleasure eats food every hundred years, or abstains therefrom; for a hundred years is as much as immortality, unending and everlasting: and, verily, for him who knows this, there shall thus be immortality, unending and everlasting; and whatever he as much as touches, as it were, with a reed, shall be for him immortal, unending and everlasting.