Shatapatha Brahmana 6.2.3.6

6.2.3.6

tamasāvādityo 'bravīt | upāhamāyānīti keneti lokampṛṇayeti tathetyeṣa vāva lokampṛṇātmanā haiva taduvāca tasmāttṛtīyā svayamātṛṇānantarhitā lokampṛṇāyā upadhīyate tasmādaśāvādityo 'nantarhito divo 'nantarhito hyeṣa etayopait

Yonder Sun said to him, 'I will step nigh!'--'Wherewith?'--'With a space-filling (brick).'--'So be it!'--Now he (the sun) indeed is the space-filler: 'by (mine own) self,' he thus means to say. Hence the third naturally-perforated one is laid on so as not to be separated from the space-filling one; and hence yonder sun is not separated from the sky, for not separated therefrom did he step nigh with this (brick).