Shiva Purana
पाखण्डिपतितोदक्यास्सूतकान्त्यजपूर्वकान् ॥ वर्जयेत्सर्वयत्नेन मनसा कर्मणा गिरा ॥ ६६ ॥
Mentally, verbally and physically he shall avoid contact with heretics, fallen men, polluted women in their menses and Śūdras, by all means.
english translation
pAkhaNDipatitodakyAssUtakAntyajapUrvakAn ॥ varjayetsarvayatnena manasA karmaNA girA ॥ 66 ॥
hk transliteration by Sanscript