Vaishnava Dharmashastra 40.1

40.1

ninditebhyo ghanādānaṃ vāṇijyaṃ kusīdajīvanam asatyabhāṣaṇaṃ śūdrasevanam ity apātrīkaraṇam ||

Receiving anything from a (Mlekkha or other) despicable person (even though not as a present, but in the form of interest, &c.), traffic (even with articles that are not forbidden to sell), subsisting by money-lending (even without exceeding the legitimate rate of interest), telling lies (even though not in giving evidence), and serving a Sûdra (even though without doing servile acts for him) are crimes rendering unworthy to receive alms.