Khadiragrihyasutra 3.2.6

3.2.6

śūrpeṇa śiṣṭānagnāvopyātipraṇītādanatipraṇītasyārdhaṃ gatvā nyañcau pāṇī kṛtvā namaḥ pṛthivyā iti japet / 6

After he has thrown the remnants (of flour) out of the basket into the fire, he should go from (the fire) which has been carried forward, to that (fire) which has not (been carried forward), and should turn his hands downwards (so as to touch the earth with them) and should murmur (the Mantra), 'Adoration to the earth's' (l.l. 3).