Śatapatha Brāhmaṇa ("of a hundred paths") 6.1.2.13

6.1.2.13

so 'gnimabravīt | tvam mā saṃdhehīti ki me tato bhaviṣyatīti tvayā mācakṣāntai yo vai putrāṇāṃ rādhyate tena pitaram pitāmaham putram pautramācakṣate tvayā mācakṣāntā atha mā saṃdhehīti tatheti tamagniḥ samadadhāttasmādetam prajāpatiṃ santamagnirityācakṣata ā ha vā enena pitaram pitāmaham putram pautraṃ cakṣate ya evaṃ veda

He said to Agni, 'Restore me!'--'What will then accrue to me?' said he.--'They shall call me after thee; for whichever of the sons succeeds (in life), after him they call the father, grandfather, son, and grandson: they shall call me after thee,--restore me, then!'--'So be it!' so (saying) Agni restored him: therefore, while being Pragâpati, they call him Agni; and verily, whosoever knows this, after him they call his father, grandfather, son, and grandson.