Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 22.2.16

22.2.16

tasmint sumnāni yajamāna ā caka ity āvat /

nara, containing (the word) ‘forward’; that which contains (the word) ‘forward’ is a symbol of the first day. ‘Forward to the horde of the Maruts, self-radiant’ is (the hymn) to the Maruts, containing (the word) ‘forward’; that which contains (the word) ‘forward’ is a symbol of the first day. ‘Forward the strong, new, hymn to Agni’ is (the hymn) to Jātavedas, containing (the word) ‘forward’; that which contains (the word) ‘forward’ is a symbol of the first day. This world with the first day they obtain, the Gāyatrī metre, the Trivṛt Stoma, the Rathantara Sāman, the eastern quarter, the spring of seasons, the Vasus the gods, Agni, born of the gods, the overlord.