Agniveshyagrihyasutra 2.5.3.7

2.5.3.7

atha tiraḥpavitraṃ sthālyāmapaḥ payo vānīyādhiśritya itaraḥpavitraṃ taṇḍulānāvapati \

Then, having poured water or milk into the pot across the strainer and set it on the fire, he pours in the husked rice grains across the strainer.