Agniveshyagrihyasutra 2.2.4.4

2.2.4.4

yathā purastād brāhmaṇānannena pariviṣya puṇyāhaṃ svastyayanamṛddhimiti vācayitvā athainaṃ dadhi madhu ghṛtamiti trivṛt prāśayati bhūstvayi dadāmi bhuvastvayi dadāmi svastvayi dadāmi bhūrbhuvaḥsvastvayi dadāmi iti \

As before, having served the Brahmins with food and caused them to pronounce 'auspicious day', 'welfare', [and] 'prosperity', he then feeds him the threefold mixture of curds, honey, and clarified butter, with: 'Earth: I place in you. Atmosphere: I place in you. Heaven: I place in you. Earth, atmosphere, heaven: I place in you.'