Agniveshyagrihyasutra 3.9.3.1

3.9.3.1

atha yājñikāt kāṣṭhādagniṃ mathitvā agnimupasamādhāya paristīryāgnimukhāt kṛtvā pakvājjuhoti hiraṇyagarbhaḥ samavartatāgre iti dvābhyām \

Then, having churned the fire from sacrificial wood, having established the fire, having strewn [darbha grass] around, and having performed the rites up to the beginning of the oblations, he offers from cooked food with the two verses: 'The Golden Embryo arose in the beginning'.