या वै सा पृथिवीय वाव सा यदिदम-स्मिन्पुरुषे शरीरमस्मिन्हीमे प्राणा प्रति-ष्ठिता एतदेव नातिशीयन्ते ॥ ३ ॥
In plain words
Whatever that earth is, that indeed is this body found within this person. For within this body these vital breaths are anchored, and they never exceed it.
Close to the Sanskrit
Which indeed that earth is, that indeed is this. Whatever is in this person the body, in this indeed these breaths are established, this very thing they do not exceed.