Mahas is Brahman. All the Vedas are increased by the Brahman. (1-2) Bhu is Prana (up-breathing), Bhuvas is Apana (down-breathing), Suvas is Vyana (back-breathing). Mahas is food. All breathings are increased by food. Thus there are these four times four, the four and four sacred interjections. He who knows these, (1-2) Knows the Brahman. All Devas bring offerings to him.