Shatapatha Brahmana 1.2.4.12

1.2.4.12

so 'gniruttarataḥ paryait | athema ita upasamarundhaṃstāntsaṃrudhyaibhiśca lokairabhinyadadhuryadu cemāṃllokānati caturtha tataḥ punarna samajihata tadetannidānena yatstambayajuḥ

Agni thereupon went round to the northern side; and they (the other gods) shut them in from here; and whilst shutting them in, they put them down with these(three)worlds; and from what fourth world there is beyond these (three) they did not rise again. Now this same (expulsion of the Asuras) is virtually the same act as the flinging away of the grass-bush.