Agniveshyagrihyasutra 2.4.10.34

2.4.10.34

kṣīrārṇave vā merau vā ādityamaṇḍale vā keśavamudvāsya naivedyamapsu nidhāya caturthāśaṃ brāhmaṇāya dadāti ityāha bhagavānāgniveśyaḥ \\10\\

Having dismissed Keśava into the ocean of milk, or onto Mount Meru, or into the solar disc, and having placed the food offering into the waters, he gives a fourth part to a Brahmin. Thus says the venerable Āgniveśya.