لَا صَرُورَةَ فِي الْإِسْلَامِ
Translation: There is no ṣarūrah in Islam.
Source: Abu Dawud
Key vocabulary: صَرُورَةَ — monastic celibacy or, in another usage, a person who has not performed Hajj; الْإِسْلَامِ — Islam.
Brief grammar: لَا صَرُورَةَ uses broad negation; صَرُورَةَ is the noun governed by لَا. In فِي الْإِسْلَامِ, فِي is a preposition and الْإِسْلَامِ is genitive.
The statement rejects treating isolation from ordinary lawful life as a religious ideal. The word ṣarūrah has more than one usage, so reducing it exclusively to “unmarried” or exclusively to “has not made Hajj” would omit part of the lexical background.