Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 2.4.29

2.4.29

yad v eva punaḥ punar nirmanthate /

ii. 6. In that he causes the fires to mount on the two Araṇis, and the two Araṇis are a chariot of the gods, verily he causes them to mount on a chariot of the gods, and he with this chariot of the gods attains in safety the world of heaven. In that also he repeatedly churns out (the fire), thereby verily by him is the re-establishment (of the fires) obtained.