Śatapatha Brāhmaṇa ("of a hundred paths") 9.5.2.12

9.5.2.12

trayo ha vai samudrāḥ | agniryajuṣām mahāvrataṃ sāmnām mahadukthamṛcāṃ sa ya etāni parasmai karotyetānha sa samudrāñcoṣayate tāñcuṣyato 'nvasya candāṃsi śuṣyanti candāṃsyanu loko lokamanvātmātmānamanu prajā paśavaḥ sa ha śvaḥ śva eva pāpīyānbhavati ya etāni parasmai karoti

Verily, there are three oceans,--the Fire-altar (being the ocean) of Yagus-formulas, the Mahâvrata (-sâman) that of Sâmans (hymn-tunes), and the Mahad uktham (Great Litany) that of Rik (verses). Whoever performs these (three rites) for another person causes these oceans to dry up for himself, and after them, thus drying up, the metres dry up for him; and after the metres the world; and after the world his own self; and after his own self his children and cattle: indeed, he who performs these for another person becomes poorer day after day.