If a Brahmana happens to have more riches than what is necessary for maintaining himself and his family for three years, he should with that riches celebrate sacrifices. A Brahmana should never acquire riches for nothing.
त्रैवार्षिकाद् यदा भक्तादधिकं स्याद् द्विजस्य तु। यजेत तेन द्रव्येण न वृथा साधयेद् धनम्॥