Hiranyakeshigrihyasutra 1.7.26.3

1.7.26.3

tasyaupāsanenāhitāgnitvaṃ tathā pārvaṇena caruṇā darśapūrṇamāsayājitvaṃ ceti \3\

On account of his worship devoted to this (fire the sacrificer) is considered as an Âhitâgni (i.e. as one who has set up the Srauta fires), and on account of his fortnightly Karu sacrifices (on the days of the new and full moon) as one who offers the sacrifices of the new and full moon (as prescribed in the Srauta ritual); so (is it taught).