Hiranyakeshigrihyasutra 2.1.3.2

2.1.3.2

jāteśmani paraśuṃ nidhāyopariṣṭāddhiraṇyaṃ teṣūttarādhareṣūpariṣṭātkumāraṃ dhārayati aśmā bhava paraśurbhava hiraṇyamastṛtaṃ bhava vedo vai putranāmāsi jīva tvaṃ śaradaḥ śatam aṅgādaṅgātsaṃbhavasi hṛdayādadhijāyase ātmā vai putranāmāsi sa jīva śaradaḥ śatamiti \2\

When the child is born, he lays an axe on a stone, and a piece of gold on that axe; after he has turned these things upside down (so that the stone lies uppermost), he holds the boy over them with (the two verses),
'Be a stone, be an axe, be insuperable gold. Thou indeed art the Veda called son; so live a hundred autumns.
'From limb by limb thou art produced; out of the heart thou art born. Thou indeed art the self (âtman) called son; so live a hundred autumns.'