Manusmriti
निन्दितेभ्यो धनादानं वाणिज्यं शूद्रसेवनम् । अपात्रीकरणं ज्ञेयमसत्यस्य च भाषणम् ॥ ६९ ॥
Accepting presents from blamed men, trading, serving Sudras, and speaking a falsehood, make (the offender) unworthy to receive gifts (Apatra).
english translation
ninditebhyo dhanAdAnaM vANijyaM zUdrasevanam । apAtrIkaraNaM jJeyamasatyasya ca bhASaNam ॥ 69 ॥
hk transliteration by Sanscript