Valmiki Ramayana Yuddha Kanda Sarga 1 Shloka 4

देवदानवयक्षाणाम्: for devas, danavas, yakshas, गन्धर्वोरगरक्षसाम्गन्धर्वोरगरक्षसाम् gandharvas ,uragas , rakshasas, अप्रधृष्याम्: unimaginable to cross, रावणेन: by Ravana, सुरक्षिताम्: highly protected, पुरीम्: city, सत्त्वम्: strength, आश्रित्य: resorted, प्रविष्टः enter, को नाम: who indeed, श्वसन्: life, निष्क्रमेत्: can return

"Indeed, who has the strength to return alive after entering that city highly protected by Ravana. It is unimaginable even for devas, danavas, yakshas, gandharvas, uragas and rakshasas to cross."