Hiranyakeshigrihyasutra 1.2.8.7

1.2.8.7

tryahe paryavete tathaiva trivṛtānnena brāhmaṇānpariviṣya puṇyāhaṃ svastyayanamṛddhimiti vācayitvā vrataṃ visṛjate \ agne vratapate vratamacāriṣam \ ityetaiḥ saṃnataiḥ \7\

After the lapse of those three days (Sûtra 1) he serves in the same way the three kinds of food (stated above) to the Brâhmanas, causes them to say, 'An auspicious day! Hail! Good luck!' and discharges himself of his vow by (repeating) these (Mantras) with (the necessary) alterations, 'Agni, lord of the vow, I have kept the vow' (see above, I, 2, 7, 8).