«إِنَّ الشَّبَابَ وَالْفَرَاغَ وَالْجِدَةَ»
Indeed, youth, free time, and wealth—
«مَفْسَدَةٌ لِلْمَرْءِ أَيَّ مَفْسَدَةِ»
may be a powerful cause of a person's corruption.
The three nouns identify different conditions, while mafsadah supplies one shared predication. The emphatic ending amplifies the warning, but the central device of jamʿ is the common judgment. The verse is a moral caution, not a claim that all young or wealthy people are necessarily corrupt.