Śatapatha Brāhmaṇa ("of a hundred paths") 8.6.3.20

8.6.3.20

ā vāco madhyamaruhadbhuraṇyuriti | etaddha vāco madhyaṃ yatraiṣa etaccīyate bhuraṇyuriti bhartaityetadayamagniḥ satpatiścekitāna ityayamagniḥ satām pratiścetayamāna ityetatpṛṣṭhe pṛthivyā nihito davidyutaditi pṛṣṭhe pṛthivyā nihito dīpyamāna ityetadadhaspadaṃ kṛṇutāṃ ye pṛtanyava ityadhaspadaṃ kurutāṃ sarvānpāpmana ityetat

[The third brick, with, Vâg. S. XV, 51], 'Unto the centre of speech did he mount, the nimble,'--for this, indeed, is the centre of speech where he now is built up; and 'the nimble (bhuranyu),' that is, 'the sustainer (bhartar);'--'this Agni, the good lord, the heedful,'--that is, 'this Agni, the lord of the good, the heeding one;'--'established upon the back of the earth, he the brilliant,'--that is, 'established on the back of the earth, the shining one;'--'let him tread under foot any hostile!'--that is, 'let him tread under foot all evildoers.'