Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 12.2.4

12.2.4

prati yad āpo adṛśramāyatīr iti pratikhyātāsu / (soma: apOṇApUṭṛIYA)

'When the approaching waters were beheld…' when they have been sighted;