Shiva Purana
कृतात्प्रतिग्रहाच्चैव याजनाच्च विशुद्धितः । अदैन्यादनतिक्लेशाद्ब्राह्मणो धनमर्जयेत् ६४ ।
A brahmin shall earn wealth without cringing or exerting himself too much. He can accept monetary gifts and fees for presiding over sacrifices duly performed.
english translation
kRtAtpratigrahAccaiva yAjanAcca vizuddhitaH । adainyAdanatiklezAdbrAhmaNo dhanamarjayet 64 ।
hk transliteration by Sanscript