Forinerly, the illustrious self-create created the four castes. Through the evil result of what deeds does a Vaishya became a Shudra?
चातुर्वण्र्यं भगवता पूर्वं सृष्टं स्वयम्भुवा। केन कर्मविपाकेन वैश्यो गच्छति शूद्रताम्॥