Śatapatha Brāhmaṇa ("of a hundred paths") 1.1.2.22

1.1.2.22

athāvarohati | dṛṃhantāṃ duryāḥ pṛthivyāmiti gṛhā vai duryāste heta īśvaro gṛhā yajamānasya yo 'syaiṣo 'dhvaryuryajñena carati tam prayantamanu pracyotostasyeśvaraḥ kulaṃ vikṣobdhostānevaitadasyām pṛthivyāṃ dṛṃhati tathā nānupracyavante tathā na vikṣobhante tasmādāha dṛṃhantāṃ duryāḥ pṛthivyāmityatha praityurvantarikṣamanvemīti so 'sāveva bandhuḥ

He then descends (from the cart), with the text (Vâg. S. I, 11 c): 'May those provided with doors stand firm on the earth!' Those provided with doors are the houses: for the houses of the sacrificer might indeed be capable of breaking down behind the back of his Adhvaryu, when he walks forward (from the cart) with the sacrifice, and might crush his (the sacrificer's) family. By this (text), however, he causes them to stand firmly on this earth, so that they do not break down and crush (his family); for this reason he says: 'May those provided with doors stand firm on the earth!' He then walks forward (north of the Gârhapatya fire), with the text (Vâg. S. I, 11 d), 'I move along the wide aërial realm;' the application of which is the same (as before; see par. 4).