Matsyapurana 126.39

126.39

tṛptiśca tenārdhamāsaṃ surāṇāṃ māsaṃ sudhābhiḥ svadhayā pitṝṇām
annena jīvantyaniśaṃ manuṣyāḥ sūryaḥ śritaṃ taddhi bibharti gobhiḥ //

The Devas are satisfied with ambrosia by the sacrificial oblations once offered into the Fire every fortnight and poured after the recitation of the prescribed formulæ suffixed by svâhâ. The Pitṛis are satisfied by the libations of water offered to them once every month (i. e., monthly oblations are offered and they get satisfied for one month.) The men live day and night on these grains and herbs. The Sun is the sustainer of all beings and He nourishes them by His rays.—38.