Shatapatha Brahmana 1.6.1.6

1.6.1.6

sa hāgniruvāca | atha yanmām purā prathamaṃ yajatha kvāham bhavānīti na tvāmāyatanāccyāvayāma iti te yadṛtūnabhihvayamānā athāgnimāyatanānnācyāvayaṃstasmādagniracyuto na ha vā āyatanāccyavate yasminnāyatane bhavati ya evametamagnimacyutaṃ veda

Agni then said, 'But whereas hitherto you used to offer prayer to me in the first place, what is now to become of me?' 'We will not remove you from your place!' said they. And since, in inviting the Seasons, they did not remove Agni from his place, for that reason Agni is immutable; and verily, he who knows that Agni to be immutable, does not move from the place where he bides.