Atharvaveda 8.10.19

8.10.19

sód akrāmat sā́ pitr̥̄́n ā́gachat tā́ṃ pitáro 'ghnata sā́ māsí sám abhavat |
tásmāt pitŕ̥bhyo māsy úpamāsyaṃ dadati prá pitr̥yā́ṇaṃ pánthāṃ jānāti yá eváṃ véda ||19||

She ascended; she came to the Fathers; the Fathers slew her; she in a month came into being; therefore to the Fathers they give in a month the monthly [oblation]; he understandeth the road that goes to the Fathers who knoweth thus.