Shatapatha Brahmana 2.2.4.8

2.2.4.8

sa yatra mriyate | yatrainamagnāvabhyādadhati tadeṣo 'gneradhijāyate 'thāsya śarīramevāgnirdahati tadyathā piturvā māturvā jāyetaivameṣo 'gneradhijāyate śaśvaddha vā eṣa na sambhavati yo 'gnihotraṃ na juhoti tasmādvā agnihotraṃ hotavyam

And when he dies, and when they place him on the fire, then he is born (again) out of the fire, and the fire only consumes his body. Even as he is born from his father and mother, so is he born from the fire. But he who offers not the Agnihotra, verily, he does not come into life at all: therefore the Agnihotra should by all means be offered.