Bhishma said In the beginning, the Lord of all creatures created the four castes and laid down their respective duties, for the sake of sacrifice.
भीष्म उवाच चातुर्वर्ण्यस्य कर्माणि चातुर्वण्र्यं च केवलम्। असृजत् स हि यज्ञार्थे पूर्वमेव प्रजापतिः॥