Manusmriti
वैरिणं नोपसेवेत सहायं चैव वैरिणः । अधार्मिकं तस्करं च परस्यैव च योषितम् ॥ १३३ ॥
Let him not show particular attention to an enemy, to the friend of an enemy, to a wicked man, to a thief, or to the wife of another man.
english translation
vairiNaM nopaseveta sahAyaM caiva vairiNaH । adhArmikaM taskaraM ca parasyaiva ca yoSitam ॥ 133 ॥
hk transliteration by Sanscript