Agniveshyagrihyasutra 2.1.4.2

2.1.4.2

atha darbheṇa hiraṇyaṃ pravadhya tadantardhāya prāñcaṃ dhāryamāṇaṃ ghṛtaṃ prāśayati bhūrṛcastvayi juhomi svāhā \

Then, having bound gold with a blade of darbha grass and placed it between, he makes the boy, held facing eastward, eat clarified butter, [reciting:] "Bhūḥ! I offer the Ṛg verses into you, svāhā!