Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.4.12

2.4.4.12

atha prātaḥ | āgneyaḥ puroḍāśo bhavatyaindraṃ sāṃnāyyam prātaḥsavanamevāsyāgneyaḥ puroḍāśo āgneyaṃ hi prātaḥsavanamathaindraṃ sāṃnāyyam mādhyandinamevāsya tatsavanamaindraṃ hi mādhyandinaṃ savanam

And on the morrow there are Agni's cake and Indra's Sânnâyya. Now Agni's cake is for him what the morning libation is (at the Soma-sacrifice), for the morning libation is indeed sacred to Agni; and the Sânnâyya is for him the mid-day libation, for the mid-day libation is indeed sacred to Indra.