In the city known as Kānyakubja there was a brāhmaṇa named Ajāmila who married a prostitute maidservant and lost all his brahminical qualities because of the association of that low-class woman.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कान्यकुब्जे द्विजः कश्चिद्दासीपतिरजामिलः । नाम्ना नष्टसदाचारो दास्याः संसर्गदूषितः
kānyakubje dvijaḥ kaściddāsīpatirajāmilaḥ | nāmnā naṣṭasadācāro dāsyāḥ saṃsargadūṣitaḥ
SB 6.1.21