Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.1.7

2.3.1.7

sa yaḥ purādityasyāstamayāt | āhavanīyamuddharatyete vai viśve devā raśmayo 'tha yatparam bhāḥ prajāpatirvā sa indro vaitadu ha vai viśve devā agnihotraṃ juhvato gṛhānāgacantisa yasyānuddhṛtamāgacanti tasmāddevā apaprayanti tadvā asmai tadvyṛdhyate yasmāddevā apaprayanti tasyānu vyṛddhiṃ yaśca veda yaśca nānuddhṛtamabhyastamagādityāhuḥ

Then, as to his taking out the Âhavanîya (from the Gârhapatya) before the setting of the sun;--the rays, doubtless, are all those gods; and what highest light there is, that, indeed, is either Pragâpati or Indra. Now all the gods approach the house of him who performs the Agnihotra: but whosesoever (offering) they approach before the fire has been taken out, from that the gods turn away, and he fails in it; and after the failure of that (offering) from which the gods turn away, people say, that, whether one knows it or not, the sun went down on account of that (fire) not having been taken out.