Know that three of these acts should form the livelihood of the Brahmanas, viz., teaching (pupils), officiating at the sacrifices of others, and the acceptance of gifts from a person who is pure.
त्रीणि कर्माणि जानीत ब्राह्मणानां तु जीविका। याजनाध्यापने चोभे शुद्धाच्चापि प्रतिग्रहः॥