Devibhagavatapurana 11.17.21

11.17.21

gāyatrī chanda ākhyātaṃ viśvāmitraṛṣiḥ smṛtaḥ |
savitā devatā proktā viniyogaśca tarpaṇe ||

The Chchhanda of Gâyatrî Tarpanam (peace offerings to Gâyatrî) is Gâyatrî; the Risi is Vis’vâmitra; Savitâ is the Devatâ; its application (Niyoga) is in the peace offerings.
“Om Bhûhrigvedapurusam tarpayâmi.”
“Om Bhuvah Yajurvedapurusam tarpayâmi.”
“Om Svah Sâmaveda purusam tarpayâmi.”
“Om Mahah Atharvaveda purusam tarpayâmi.”
“Om Janah Itihâsapurâna purusam tarpayâmi.”
“Om Tapah Sarvâgama purusam tarpayâmi.”
“Om Satyam Satyaloka purusam tarpayâmi.”
“Om Bhûh bhûrloka purusam tarpayâmi.”
“Om Bhuvah bhuvoloka purusam tarpayâmi.”
“Om Svah svarloka purusam tarpayâmi.”
“Om Bhûh rekapadâm Gâyatrîm tarpayâmi.”
“Om Bhuvo dvîtîyapadâm Gâyatrîm tarpayâmi.”
“Om Svastripadâm Gâyatrim tarpayâmi.”
“Om Bhûrbhûvah Svas’chatuspadâm Gâyatrîm tarpayâmi.”
Pronouncing these, offer the Tarpanams. Next add the word Tarpayâmi to each of the following words “Ûsasîm, Gâyatrîm, Sâvitrîm, Sarasvatim Vedamâtaram, Prithvîm, Ajâm, Kaus’îkîm, Sâmkritîm, Savajitîm, etc.,” and offer Tarpanams. After the Tarpanam is over, offer the peace-chantings, (S’ântivâri) repeating the following mantras.
“Om Jâta vedase sunavâma romam, etc.”
“Om Mânastoka, etc.”
“Om Tryamvakam Yajâmahe, etc.”
“Om Tachchhamyoh, etc.”
Then touch all the parts of your bodies, repeating the two mantra, “Om atodeva, etc.” And reciting the mantram “Svonâ Prithivî,” bow down to the earth, after repeating one’s name, Gotra, etc.