Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.1.1

2.4.1.1

atha hute 'gnihotra upatiṣṭhate | bhūrbhuvaḥ svariti tatsatyenaivaitadvācaṃ samardhayati yadāha bhūrbhuvaḥ svariti tayā samṛddhayāśiṣamāśāste supoṣaḥ poṣairiti tatpuṣṭimāśāste

Now after the performance of the Agnihotra he (optionally).approaches the fires with (Vâg. S. III, 37), 'Earth! ether! sky!' In saying 'Earth! ether! sky!' he renders his speech auspicious by means of the truth, and with that (speech) thus rendered propitious he invokes a blessing:--'May I be well supplied with offspring!' whereby he prays for offspring; '--well supplied with men!' whereby he prays for men (heroes); '--well supplied with viands!' whereby he prays for prosperity.