Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.1.4

2.3.1.4

sa yatsāyamastamite juhoti | garbhamevaitatsantamabhijuhoti garbhaṃ santamabhikaroti sa yadgarbhaṃ santamabhijuhoti tasmādime garbhā anaśnanto jīvanti

Now when he offers in the evening after sunset, he offers for the good of that (sun) in the embryo state, he benefits that embryo; and since he offers for the good of that (sun) in the embryo state, therefore embryos here live without taking food.