Manusmriti
शक्तेनापि हि शूद्रेण न कार्यो धनसञ्चयः । शूद्रो हि धनमासाद्य ब्राह्मणानेव बाधते ॥ १२९ ॥
No collection of wealth must be made by a Sudra, even though he be able (to do it); for a Sudra who has acquired wealth, gives pain to Brahmanas.
english translation
zaktenApi hi zUdreNa na kAryo dhanasaJcayaH । zUdro hi dhanamAsAdya brAhmaNAneva bAdhate ॥ 129 ॥
hk transliteration by Sanscript