Hiranyakeshigrihyasutra 2.1.4.9

2.1.4.9

tamagnimupasamādhāya vyāhṛtiparyantaṃ kṛtvā \ dhātā dadātu no rayim \ iti dvādaśāhutīrjuhoti \ trayodaśetyekeṣām \9\

Having put wood on that fire, and having performed the rites down to the Vyâhriti oblations, they sacrifice twelve oblations with the verses, 'May Dhâtri give us wealth' (III, 3, II, 2-5); according to some (teachers they make) thirteen (oblations).