Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.5.1

4.3.5.1

trayā vai devāḥ | vasavo rudrā ādityāsteṣāṃ vibhaktāni savanāni vasūnāmeva prātaḥsavanaṃ rudrāṇām mādhyandinaṃ savanamādityānāṃ tṛtīyasavanaṃ tadvā amiśrameva vasūnām prātaḥsavanamamiśraṃ rudrāṇām mādhyandinaṃ savanam miśramādityānāṃ tṛtīyasavanam

Now there are three kinds of gods,--the Vasus, the Rudras, and the Âdityas. Between them the press-feasts are divided: the morning pressing belongs to the Vasus, the midday pressing to the Rudras, and the third pressing to the Âdityas. But the morning pressing belonged to the Vasus exclusively, and the midday pressing to the Rudras exclusively, and the third pressing to the Âdityas conjointly (with others).