Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.2.3

6.7.2.3

athainamiṇḍvābhyām parigṛhṇāti | naktoṣāsā samanasā virūpe ityahorātre vai naktoṣāsā samanasā virūpe dhāpayete śiśumekaṃ samīcī iti yadvai kiṃ cāhorātrayostenaitameva samīcī dhāpayete dyāvākṣāmā rukbho antarvibhātīti harannetadyajurjapatīme vai dyāvāpṛthivī dyāvākṣāmā te eṣa yannantarā vibhāti tasmādetaddharanyajurjapati devā agniṃ dhārayandraviṇodā iti parigṛhya nidadhāti prāṇā vai devā draviṇodāsta etamagra evamadhārayaṃstairevainametaddhārayati

He then takes hold of him by means of the two pads, with (Vâg. S. XII, 2), 'Night and Dawn, of one mind, unlike in form,'--night and dawn, doubtless, are day and night, (and they are) of one mind, and unlike in form;--'nourish one child, combining together,'--whatever belongs to the day and the night, therewith they, combining together, indeed nourish him (Agni);--'a golden disk, he shineth between heaven and earth,'--whilst taking it (the fire), he mutters this prayer; for heaven and earth are those two, the sky and the earth; and moving between these two he shines: that is why, in taking it, he mutters this prayer;--'the wealth-giving gods kept Agni;'--therewith, having taken hold of it in both hands, he sets it down; for the wealth-giving gods are the vital airs, and they indeed kept up Agni at first: by means of them he now keeps him up.