Manusmriti
समैर्हि विषमं यस्तु चरेद् वै मूल्यतोऽपि वा । समाप्नुयाद् दमं पूर्वं नरो मध्यममेव वा ॥ २८७ ॥
But that man who behaves dishonestly to honest (customers) or cheats in his prices, shall be fined in the first or in the middlemost amercement.
english translation
samairhi viSamaM yastu cared vai mUlyato'pi vA । samApnuyAd damaM pUrvaM naro madhyamameva vA ॥ 287 ॥
hk transliteration by Sanscript