Shatapatha Brahmana 7.4.1.31

7.4.1.31

tribhirupatiṣṭhate | traya ime lokā atho trivṛdagniryāvānagniryāvatyasya mātrā tāvataivāsmā etadimāṃlokāntsthāpayatyatho tāvataivaitadidam marvaṃ śamayati tiṣṭhannupatiṣṭhate tiṣṭhantīva vā ime lokā atho tiṣṭhanvai vīryavattaraḥ

With three (formulas) he worships,--three are these worlds, and threefold, also, is Agni: as great as Agni is, as great as is his measure, by so much he thus stops these worlds (from moving); and by so much does he appease everything here. Standing he worships, for these worlds stand, as it were; and besides, while standing one is stronger.