An unchaste woman is very easily carried away by paramours, and it sometimes happens that her husband is violently killed by her paramours. If the yogī gives his mind a chance and does not restrain it, his mind will give facility to enemies like lust, anger and greed, and they will doubtlessly kill the yogī.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नित्यं ददाति कामस्य च्छिद्रं तमनु येऽरयः । योगिनः कृतमैत्रस्य पत्युर्जायेव पुंश्चली
nityaṃ dadāti kāmasya cchidraṃ tamanu ye'rayaḥ | yoginaḥ kṛtamaitrasya patyurjāyeva puṃścalī
SB 5.6.4