Manusmriti
इतरेषां तु पण्यानां विक्रयादिह कामतः । ब्राह्मणः सप्तरात्रेण वैश्यभावं नियच्छति ॥ ९३ ॥
But by willingly selling in this world other (forbidden) commodities, a Brahmana assumes after seven nights the character of a Vaisya.
english translation
itareSAM tu paNyAnAM vikrayAdiha kAmataH । brAhmaNaH saptarAtreNa vaizyabhAvaM niyacchati ॥ 93 ॥
hk transliteration by Sanscript