Śrī Camasa said: Each of the four social orders, headed by the brāhmaṇas, was born through different combinations of the modes of nature, from the face, arms, thighs and feet of the Supreme Lord in His universal form. Thus the four spiritual orders were also generated.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
चमस उवाच । मुखबाहूरुपादेभ्यः पुरुषस्याश्रमैः सह । चत्वारो जज्ञिरे वर्णा गुणैर्विप्रादयः पृथक्
camasa uvāca | mukhabāhūrupādebhyaḥ puruṣasyāśramaiḥ saha | catvāro jajñire varṇā guṇairviprādayaḥ pṛthak
SB 11.5.2