Valmiki Ramayana Kishkindha Kanda Sarga 13 Shloka 21

पक्षिणः birds, तथा so also, अन्ये other, वनचारिणः wild animals, एतत् this place, वर्जयन्ति avoid, ये whoever, मोहात् by ignorance, अत्र there, विशन्ति enter, ते they, पुनः again, न निवर्तन्ति do not return.

'Birds and wild animals avoid the hermitage and whoever enters there out of ignorance never returns.