purusasya-of the Supreme Personality of Godhead; mukham-mouth; brahma-is the brahmanas; ksatram-the royal order; etasya-of Him; bahavah-the arms; urvoh-the thighs; vaisyah-are the mercantile men; bhagavatah-of the Personality of Godhead; padbhyam-from His legs; sudrah-the laborer class; vyajayata-became manifested.