Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.3.4

6.7.3.4

yadveva pratyavarohati | etadvā etadimāṃlokānita ūrdhvo rohati sa sa parāṅiva roha iyamu vai pratiṣṭhā tadyattāvadeva syātpra hāsmāllokādyajamānaścyavetātha yatpratyavarohatīmāmevaitatpratiṣṭhāmabhipratyaityasyāmevaitatpratiṣṭhāyām pratitiṣṭhati

And, again, why he lowers it,--he then indeed rises upwards from here through these worlds: that is, as it were, a rising away from here. But this earth is the resting-place; and were that always to be so, the Sacrificer would be removed from this world. But when he lowers (the fire), he thereby comes back to this resting-place, and stands firmly on this resting-place.