Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 5.10.30

5.10.30

atha yat svair agnibhir yajamānam saṃskurvanti /

v. 10. In that they lay to rest the sacrificer with his own fires , and the fires are a chariot of the gods, verily thus they lay him to rest on a chariot of the gods; he with this chariot of the gods goes to the world of heaven, where is the world of those who do good.