Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.1.5

3.7.1.5

sa prokṣati | dive tvāntarikṣāya tvā pṛthivyai tveti vajro vai yūpa eṣāṃ lokānāmabhiguptyā eṣāṃ tvā lokānāmabhiguptyai prokṣāmītyevaitadāha

He sprinkles (the top, middle, and bottom parts) with, 'For the sky--thee! for the air--thee! for the earth--thee!' the stake being a thunderbolt (he does so) for the protection of these worlds: 'I sprinkle thee for the protection of these worlds,' is what he thereby means to say.