Śatapatha Brāhmaṇa ("of a hundred paths") 3.5.4.22

3.5.4.22

athādhiṣavaṇe phalake upadadhāti | rakṣohaṇau vāṃ valagahanā upadadhāmi vaiṣṇavī iti hanū haivāsyaite atha paryūhati rakṣohaṇau vāṃ valagahanau paryūhāmi vaiṣṇavī iti dṛṃhatyevaine etadaśithile karoti

Thereon he lays two pressing-boards with, 'You, the Rakshas-killers, the charm-killers, Vishnu's own, I lay down;' they are indeed his (Vishnu's) jaws. He surrounds them (with earth) with, 'You, the Rakshas-killers, the charm-killers, Vishnu's own, I surround;' he thereby steadies them, makes them immovable.