Shatapatha Brahmana 6.8.1.7

6.8.1.7

athainamudyacati | udu tvā viśve devā agne bharantu cittibhiriti viśve vā etamagre devāścittibhirudabharannetaddhyeṣāṃ tadā cittamāsīttathaivainamayametaccitibhirudbharatyetaddhyasya tadā cittam bhavati sa no bhava śivastvaṃ supratīko vibhāvasuriti yathaiva yajustathā bandhustaṃ dakṣiṇata udañcamādadhāti tasyo bandhu sthālyāṃ gārhapatyaṃ samupyāparamādadhāti sa yadi kāmayetopādhirohetpārśvato vā vrajet

He then lifts him (the fire) up, with (Vâg. S. XII, 31), 'Upwards may the All-gods bear thee, O Agni, by their thoughts!'--at the beginning all the gods did indeed bear him upwards by their thoughts, for that (or, he) was then their thought: in like manner does this (Sacrificer) now bear him upwards by his thoughts, for this now is his thought;--'be thou gracious unto us, of fair look, and rich splendour!'--as the text, so its meaning. From the south he places him (Agni) northwards on (the chariot)--the significance of this has been explained. Having put the Gârhapatya into a pot, he places it on (the chariot) behind (the Âhavanîya, or Ukhya Agni). If he choose, he himself may mount up beside him (Agni), or he may walk by the side (of the chariot).