Shatapatha Brahmana 6.2.3.4

6.2.3.4

tānvāyurabravīt | upāhamāyānīti keneti digbhiriti tatheti diśyābhirha taduvāca tasmāddvitīyāyai svayamātṛṇāyā anantarhitā diśyā upadhīyante tasmādantarikṣādanantarhitā diśo 'nantarhito vāyuranantarhito hyeṣa etābhirupait

Vâyu said to them, 'I will step nigh!' Wherewith!'--'With the regions!'--'So be it!' He thereby doubtless meant to say, 'with the regional (bricks):' hence on the second naturally-perforated one the regional ones are laid, without being separated from it; and hence not separated from the air are the regions, the wind; for not separated therefrom he (Vâyu) stepped nigh with this (brick).