अन्तरिक्षोदरः कोशो भूमिबुध्नो न जीर्यति दिशो ह्यस्य स्रक्तयो द्यौरस्योत्तरं बिलं स एष कोशो वसुधानस्तस्मिन्विश्वमिदं श्रितम् ॥ ३.१५.१ ॥
In plain words
The chest whose belly is the middle region and whose bottom is the earth does not decay; for the quarters are its corners, and the sky is its upper opening. This chest is the holder of wealth, and in it all this rests.