Hiranyakeshigrihyasutra 2.5.15.9

2.5.15.9

upasthitenna odanasya māṃsānāmiti samavadāya sarpirmiśrasya juhoti \ ekāṣṭakāṃ paśyata dohamānāmannaṃ māṃsavadghṛtavatsvadhāvat tadbrāhmaṇairatipūtamannaṃtamakṣitaṃ tanme astu svadhā namaḥ ekāṣṭakā tapasā tapyamānā saṃvatsarasya patnī duduhe prapīnā \ taṃ dohamupajīvātha pitaraḥ saṃvidānāḥ sviṣṭoyaṃ suhuto mamāstu \ svadhā namaḥ \ saṃvatsarasya pratimām \ iti \9\

When the food (for the Brâhmanas) is ready, he cuts off (the Avadânas) together from the mess of boiled rice, and from the pieces of meat, and mixing them with clarified butter he makes oblations thereof with the verses, 'Behold the Ekâshtakâ, the giver of food with meat and ghee, (which is offered) with (the word) svadhâ. By the Brâhmanas that food is purified. May it be an imperishable (blessing) to me! Svadhâ! Adoration!'
'The Ekâshtakâ, devoting herself to austerities, the consort of the year, exuberant (with milk), has poured forth milk. May you live on that milk, O Fathers, all together. May this (food) be well offered and well sacrificed by me! Svadhâ! Adoration!
'The image of the year' (Taitt. Samh. V, 7, 2, 1).