Manusmriti
कारुकान् शिल्पिनश्चैव शूद्रांश्चात्मोपजीविनः । एकैकं कारयेत् कर्म मासि मासि महीपतिः ॥ १३८ ॥
Mechanics and artisans, as well as Sudras who subsist by manual labour, he may cause to work (for himself) one (day) in each month.
english translation
kArukAn zilpinazcaiva zUdrAMzcAtmopajIvinaH । ekaikaM kArayet karma mAsi mAsi mahIpatiH ॥ 138 ॥
hk transliteration by Sanscript