Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 12.2.6

12.2.6

āpo na devīr upa yanti hotriyam iti hotṛ camase avanīyamānāsu / (soma: apOṇApUṭṛIYA)

'The divine waters approach the cup of the hotṛ…' when they are being poured into the cup of the hotṛ;