يَأْتِي عَلَى النَّاسِ زَمَانٌ، لَا يُبَالِي الْمَرْءُ مَا أَخَذَ مِنْهُ، أَمِنَ الْحَلَالِ أَمْ مِنَ الْحَرَامِ
Translation: A time will come when a person will not care how he acquired wealth—whether from a lawful or unlawful source.
Source: البخاري
لَا يُبَالِي الْمَرْءُ means “a person does not care.” مَا أَخَذَ مِنْهُ points to what or where the person acquired the gain. أَمِنَ الْحَلَالِ أَمْ مِنَ الْحَرَامِ directly contrasts lawful and unlawful sources.
The warning is not merely about accumulating wealth. It concerns the disappearance of concern for how wealth is obtained.