Those before them had already said it, but they were not availed by what they used to earn.
The Saheeh International Quran Translation
قَدْ قَالَهَا ٱلَّذِينَ مِن قَبْلِهِمْ فَمَآ أَغْنَىٰ عَنْهُم مَّا كَانُوا۟ يَكْسِبُونَThose before them had already said it, but they were not availed by what they used to earn.