तेजोऽशितं त्रेधा विधीयते तस्य यः स्थविष्ठो धातुस्तदस्थि भवति यो मध्यमः स मज्जा योऽणिष्ठः सा वाक् ॥ ३ ॥
In plain words
Consumed fire is divided in three ways. Its grossest part becomes bone, its middle part becomes marrow, and its subtlest part becomes speech.
Close to the Sanskrit
Fire eaten is divided in three ways. Of it, whatever is the grossest constituent, that bone becomes; whatever is the middle, that is marrow; whatever is the subtlest, that is speech. 3