Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.2.7

1.3.2.7

atha yānyājyāni gṛhyante | ṛtubhyaścaiva tāni candobhyaśca gṛhyante tattadanādiśyājyasyaiva rūpeṇa gṛhṇāti sa vai caturjuhvām gṛhṇātyaṣṭau kṛtva upabhṛti

And whatever oblations of butter are taken, they are taken for the seasons and the metres. Every one of them he takes in the form of butter without announcing it (to any particular deity). In the guhû he takes of it four times (with the sruva from the pot), in the upabhrit eight times.