Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.1.26

1.5.1.26

athāgnimīkṣamāṇo japati | viśve devāḥ śāstana mā yatheha hotā vṛto manavai yanniṣadya pra me brūta bhāgadheyaṃ yathā vo yena pathā havyamā vo vahānīti yathā yebhyaḥ pakvaṃ syāttānbrūyādvanu mā śāsta yathā va āhariṣyāmi yathā vaḥ parivekṣyāmītyevamevaitaddeveṣu praśāsanamicate 'nu mā śāsta yathā vo 'nuṣṭhyā vaṣaṭkuryāmanuṣṭyā havyaṃ vaheyamiti tasmādevaṃ japati

He then mutters whilst looking at the (Âhavanîya) fire, 'All ye gods, instruct me, how and what I am to mind while seated here as the chosen Hotri! declare my share (of the sacrificial duties), how and by what road I am to convey the oblation to you!'--for as one says to those for whom food has been cooked, 'order me how I am to bring if you, how I am to serve it up for you!' in like manner he is desirous of directions regarding the gods, and for this reason he mutters thus, 'instruct me how I may utter the Vashat-call for you in its proper order, how I may bring you the oblation in its proper order!'